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    <title>Pinboard (Vaguery)</title>
    <link>https://pinboard.in/u:Vaguery/public/</link>
    <description>recent bookmarks from Vaguery</description>
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      <rdf:Seq>	<rdf:li rdf:resource="https://arxiv.org/abs/1906.12272"/>
	<rdf:li rdf:resource="https://www.quantamagazine.org/coder-physicists-are-simulating-the-universe-to-unlock-its-secrets-20180612/"/>
	<rdf:li rdf:resource="https://arxiv.org/abs/1808.01862"/>
	<rdf:li rdf:resource="https://www.atlasobscura.com/articles/ansel-adams-mystery-astronomy"/>
	<rdf:li rdf:resource="https://arxiv.org/abs/1105.6344#"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1405.0193"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1401.7637"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1404.3253"/>
	<rdf:li rdf:resource="http://www.skyandtelescope.com/astronomy-news/observing-news/binocular-comet-lovejoy-heading-c2014-q2-lovejoy-1211142/"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1403.0795"/>
	<rdf:li rdf:resource="http://lanl.arxiv.org/abs/1401.5585"/>
	<rdf:li rdf:resource="http://lanl.arxiv.org/abs/1403.6638"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1401.5794"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1412.1840"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1309.0790"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1408.1206"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1309.2942"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1211.6582"/>
	<rdf:li rdf:resource="http://io9.com/5936271/and-now-a-video-of-2299-confirmed-exoplanets-orbiting-a-single-star"/>
	<rdf:li rdf:resource="http://spaceweather.com/archive.php?view=1&amp;day=21&amp;month=06&amp;year=2011"/>
	<rdf:li rdf:resource="http://www.pinholephotography.org/Solargraph instructions 2.htm"/>
	<rdf:li rdf:resource="http://www.space.com/11907-mars-history-martian-illusions-human-delusions.html"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1006.4354"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1005.5636"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1005.1527"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1001.5210"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/1003.4002"/>
	<rdf:li rdf:resource="http://science.nasa.gov/headlines/y2010/17feb_3dsun.htm"/>
	<rdf:li rdf:resource="http://arxiv.org/abs/0910.3989"/>
	<rdf:li rdf:resource="http://bayes.wordpress.com/2009/01/15/its-the-freakiest-show/#comment-8604"/>
	<rdf:li rdf:resource="http://www.inquinamentoluminoso.it/dmsp/artbri.html"/>
	<rdf:li rdf:resource="http://www.spitzer.caltech.edu/Media/releases/ssc2008-10/release.shtml"/>
	<rdf:li rdf:resource="http://pruned.blogspot.com/2008/02/titanic-lakes.html"/>
	<rdf:li rdf:resource="http://science.nasa.gov/headlines/y2008/30jan_mercurysurprise.htm?list214102"/>
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  </channel><item rdf:about="https://arxiv.org/abs/1906.12272">
    <title>[1906.12272] Weighing the Sun with five photographs</title>
    <dc:date>2021-07-16T10:29:17+00:00</dc:date>
    <link>https://arxiv.org/abs/1906.12272</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[With only five photographs of the Sun at different dates we show that the mass of Sun can be calculated by using a telescope, a camera, and the Kepler's third law. With these photographs we are able to calculate the distance between Sun and Earth at different dates in a period of time of about three months. These distances allow us to obtain the correct elliptical orbit of Earth, proving the Kepler's first law. 
The analysis of the data extracted from photographs is performed by using an analytical optimization approach that allow us to find the parameters of the elliptical orbit. Also, it is shown that the five data points fit an ellipse using an geometrical scheme. The obtained parameters are in very good agreement with the ones for Earth's orbit, allowing us to foresee the future positions of Earth along its trajectory. The parameters for the orbit are used to calculate the Sun's mass by applying the Kepler's third law and Newton's law for gravitation. This method gives a result wich is in excellent agreement with the correct value for the Sun's mass. Thus, in a span of time of about three months, any student is capable to calculate the mass of the sun with only five photographs, a telescope and a camera.
]]></description>
<dc:subject>mathematical-recreations astronomy physics looking-to-see inverse-problems rather-interesting</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:ab52c5dbe507/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:mathematical-recreations"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:physics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:looking-to-see"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:inverse-problems"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
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</item>
<item rdf:about="https://www.quantamagazine.org/coder-physicists-are-simulating-the-universe-to-unlock-its-secrets-20180612/">
    <title>Coder-Physicists Are Simulating the Universe to Unlock Its Secrets | Quanta Magazine</title>
    <dc:date>2018-10-13T10:47:49+00:00</dc:date>
    <link>https://www.quantamagazine.org/coder-physicists-are-simulating-the-universe-to-unlock-its-secrets-20180612/</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[These small, faint galaxies have always presented problems. The “missing satellite problem,” for instance, is the expectation, based on standard cold dark matter models, that hundreds of satellite galaxies should orbit every spiral galaxy. But the Milky Way has just dozens. This has caused some physicists to contemplate more complicated models of dark matter. However, when Hopkins and colleagues incorporated realistic superbubbles into their simulations, they saw many of those excess satellite galaxies go away. Hopkins has also found potential resolutions to two other problems, called “cusp-core” and “too-big-to-fail,” that have troubled the cold dark matter paradigm.

]]></description>
<dc:subject>simulation looking-to-see astronomy rather-interesting to-write-about the-mangle-in-practice (totally)</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:20088dccd123/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:simulation"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:looking-to-see"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:to-write-about"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:the-mangle-in-practice"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:(totally)"/>
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<item rdf:about="https://arxiv.org/abs/1808.01862">
    <title>[1808.01862] Yes, Aboriginal Australians Can and Did Discover the Variability of Betelgeuse</title>
    <dc:date>2018-08-20T12:41:09+00:00</dc:date>
    <link>https://arxiv.org/abs/1808.01862</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Recently, a widely publicized claim has been made that the Aboriginal Australians discovered the variability of the red star Betelgeuse in the modern Orion, plus the variability of two other prominent red stars: Aldebaran and Antares. This result has excited the usual healthy skepticism, with questions about whether any untrained peoples can discover the variability and whether such a discovery is likely to be placed into lore and transmitted for long periods of time. Here, I am offering an independent evaluation, based on broad experience with naked-eye sky viewing and astro-history. I find that it is easy for inexperienced observers to detect the variability of Betelgeuse over its range in brightness from V = 0.0 to V = 1.3, for example in noticing from season-to-season that the star varies from significantly brighter than Procyon to being greatly fainter than Procyon. Further, indigenous peoples in the Southern Hemisphere inevitably kept watch on the prominent red star, so it is inevitable that the variability of Betelgeuse was discovered many times over during the last 65 millennia. The processes of placing this discovery into a cultural context (in this case, put into morality stories) and the faithful transmission for many millennia is confidently known for the Aboriginal Australians in particular. So this shows that the whole claim for a changing Betelgeuse in the Aboriginal Australian lore is both plausible and likely. Given that the discovery and transmission is easily possible, the real proof is that the Aboriginal lore gives an unambiguous statement that these stars do indeed vary in brightness, as collected by many ethnographers over a century ago from many Aboriginal groups. So I strongly conclude that the Aboriginal Australians could and did discover the variability of Betelgeuse, Aldebaran, and Antares.
]]></description>
<dc:subject>cultural-assumptions astronomy history-of-science colonialism science-studies to-write-about</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:6aa30638f7ea/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:cultural-assumptions"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:history-of-science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:colonialism"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:science-studies"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:to-write-about"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="https://www.atlasobscura.com/articles/ansel-adams-mystery-astronomy">
    <title>Solved: A Decades-Old Ansel Adams Mystery - Atlas Obscura</title>
    <dc:date>2018-04-30T11:20:56+00:00</dc:date>
    <link>https://www.atlasobscura.com/articles/ansel-adams-mystery-astronomy</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[WHEN YOU LOOK AT THE image above, what do you think of? Most will probably take in the beauty of its subjects, the mountain Denali and nearby Wonder Lake. A photographer might admire the skill of its creator, Ansel Adams. Adventurers may feel the urge to climb.

Donald Olson sees all that and something else: a mystery. He wants to know the moment it was taken. An astrophysicist and forensic astronomer, Olson uses quantitative methods to answer questions raised by artwork, literature, and historical accounts—not the heady ones, but the basic, surprisingly slippery who, what, when, and where.

]]></description>
<dc:subject>photography art-history rather-interesting inverse-problems astronomy via:kottke.org</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:c942e5b71130/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:photography"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:art-history"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:inverse-problems"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:via:kottke.org"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="https://arxiv.org/abs/1105.6344#">
    <title>[1105.6344] Prototype selection for parameter estimation in complex models</title>
    <dc:date>2017-02-27T12:34:46+00:00</dc:date>
    <link>https://arxiv.org/abs/1105.6344#</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Parameter estimation in astrophysics often requires the use of complex physical models. In this paper we study the problem of estimating the parameters that describe star formation history (SFH) in galaxies. Here, high-dimensional spectral data from galaxies are appropriately modeled as linear combinations of physical components, called simple stellar populations (SSPs), plus some nonlinear distortions. Theoretical data for each SSP is produced for a fixed parameter vector via computer modeling. Though the parameters that define each SSP are continuous, optimizing the signal model over a large set of SSPs on a fine parameter grid is computationally infeasible and inefficient. The goal of this study is to estimate the set of parameters that describes the SFH of each galaxy. These target parameters, such as the average ages and chemical compositions of the galaxy's stellar populations, are derived from the SSP parameters and the component weights in the signal model. Here, we introduce a principled approach of choosing a small basis of SSP prototypes for SFH parameter estimation. The basic idea is to quantize the vector space and effective support of the model components. In addition to greater computational efficiency, we achieve better estimates of the SFH target parameters. In simulations, our proposed quantization method obtains a substantial improvement in estimating the target parameters over the common method of employing a parameter grid. Sparse coding techniques are not appropriate for this problem without proper constraints, while constrained sparse coding methods perform poorly for parameter estimation because their objective is signal reconstruction, not estimation of the target parameters.
]]></description>
<dc:subject>astronomy archetypal-analysis dimension-reduction big-data modeling to-write-about performance-measure rather-interesting</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:84d0de6ee555/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:archetypal-analysis"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:dimension-reduction"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:big-data"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:modeling"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:to-write-about"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:performance-measure"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
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</item>
<item rdf:about="http://arxiv.org/abs/1405.0193">
    <title>[1405.0193] The complex planetary synchronization structure of the solar system</title>
    <dc:date>2015-09-07T19:55:17+00:00</dc:date>
    <link>http://arxiv.org/abs/1405.0193</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[The complex planetary synchronization structure of the solar system, which since Pythagoras of Samos (ca. 570-495 BC) is known as the music of the spheres, is briefly reviewed from the Renaissance up to contemporary research. Copernicus' heliocentric model from 1543 suggested that the planets of our solar system form a kind of mutually ordered and quasi-synchronized system. From 1596 to 1619 Kepler formulated preliminary mathematical relations of approximate commensurabilities among the planets, which were later reformulated in the Titius-Bode rule (1766-1772) that successfully predicted the orbital position of Ceres and Uranus. Following the discovery of the ~11 yr sunspot cycle, in 1859 Wolf suggested that the observed solar variability could be approximately synchronized with the orbital movements of Venus, Earth, Jupiter and Saturn. Modern research have further confirmed that: (1) the planetary orbital periods can be approximately deduced from a simple system of resonant frequencies; (2) the solar system oscillates with a specific set of gravitational frequencies, and many of them (e.g. within the range between 3 yr and 100 yr) can be approximately constructed as harmonics of a base period of ~178.38 yr; (3) solar and climate records are also characterized by planetary harmonics from the monthly to the millennia time scales. This short review concludes with an emphasis on the contribution of the author's research on the empirical evidences and physical modeling of both solar and climate variability based on astronomical harmonics. The general conclusion is that the solar system works as a resonator characterized by a specific harmonic planetary structure that synchronizes also the Sun's activity and the Earth's climate.
]]></description>
<dc:subject>rather-interesting astronomy nonlinear-dynamics visualization</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:600b59a7212e/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nonlinear-dynamics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:visualization"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1401.7637">
    <title>[1401.7637] Guaman Poma's Yupana and Inca Astronomy</title>
    <dc:date>2015-03-10T10:17:49+00:00</dc:date>
    <link>http://arxiv.org/abs/1401.7637</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[An explanation is provided for the Inca counting board described by Guaman Poma in 1615. Although the board could have been used in more than one way, we show that based on certain reasonable assumptions regarding non-uniform representation of numbers its most likely use was counting in multiples of 6, 24, and 72. The independent numbers represented on its five rows are 92, 31, 29, 79, and 56 that appear to be astronomically connected to sub-periods within the year and planet periods in a manner similar to Mayan astronomy. Based on these and other considerations we propose that the board fulfilled an astronomical counting function.
]]></description>
<dc:subject>history-of-science history astronomy anthropology after-the-fact rather-interesting</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:f58fe1468c77/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:history-of-science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:history"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:anthropology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:after-the-fact"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1404.3253">
    <title>[1404.3253] Are Supernovae Recorded in Indigenous Astronomical Traditions?</title>
    <dc:date>2015-02-07T12:39:06+00:00</dc:date>
    <link>http://arxiv.org/abs/1404.3253</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Novae and supernovae are rare astronomical events that would have had an influence on the sky-watching peoples who witnessed them. Although several bright novae/supernovae have been visible during recorded human history, there are many proposed but no confirmed accounts of supernovae in oral traditions or material culture. Criteria are established for confirming novae/supernovae in oral and material culture, and claims from around the world are discussed to determine if they meet these criteria. Australian Aboriginal traditions are explored for possible descriptions of novae/supernovae. Although representations of supernovae may exist in Indigenous traditions, and an account of a nova in Aboriginal traditions has been confirmed, there are currently no confirmed accounts in Indigenous oral or material traditions.
]]></description>
<dc:subject>astronomy history rather-interesting</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:e0931a3e2a69/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:history"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://www.skyandtelescope.com/astronomy-news/observing-news/binocular-comet-lovejoy-heading-c2014-q2-lovejoy-1211142/">
    <title>Binocular Comet Lovejoy Heading Our Way - Sky &amp; Telescope</title>
    <dc:date>2015-01-02T00:36:50+00:00</dc:date>
    <link>http://www.skyandtelescope.com/astronomy-news/observing-news/binocular-comet-lovejoy-heading-c2014-q2-lovejoy-1211142/</link>
    <dc:creator>Vaguery</dc:creator><dc:subject>astronomy binoculars back-yard-sciencing</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:cba0e1fa1201/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:binoculars"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:back-yard-sciencing"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1403.0795">
    <title>[1403.0795] Electric Current Circuits in Astrophysics</title>
    <dc:date>2015-01-01T13:20:27+00:00</dc:date>
    <link>http://arxiv.org/abs/1403.0795</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Cosmic magnetic structures have in common that they are anchored in a dynamo, that an external driver converts kinetic energy into internal magnetic energy, that this magnetic energy is transported as Poynting flux across the magnetically dominated structure, and that the magnetic energy is released in the form of particle acceleration, heating, bulk motion, MHD waves, and radiation. The investigation of the electric current system is particularly illuminating as to the course of events and the physics involved. We demonstrate this for the radio pulsar wind, the solar flare, and terrestrial magnetic storms.
]]></description>
<dc:subject>astronomy cosmology magnetism physics just-plain-science</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:a652b1399399/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:cosmology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:magnetism"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:physics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:just-plain-science"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://lanl.arxiv.org/abs/1401.5585">
    <title>[1401.5585] Water-filled telescopes</title>
    <dc:date>2014-12-28T13:47:15+00:00</dc:date>
    <link>http://lanl.arxiv.org/abs/1401.5585</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[In this short note we discuss the case of the thought experiments on water-filled telescopes and their realizations during 18th and 19th century. The story of those instruments shows that the scientific progress occurs in a curious way, since there was no stringent reason for the construction of a water-filled telescope.
]]></description>
<dc:subject>history-of-science the-mangle-in-practice astronomy rather-interesting thought-experiments experiment</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:13580f3c715a/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:history-of-science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:the-mangle-in-practice"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:thought-experiments"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:experiment"/>
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</item>
<item rdf:about="http://lanl.arxiv.org/abs/1403.6638">
    <title>[1403.6638] The first measurement of the deflection of the vertical in longitude -- The figure of the earth in the early 19th century</title>
    <dc:date>2014-12-28T13:45:14+00:00</dc:date>
    <link>http://lanl.arxiv.org/abs/1403.6638</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[During the summer of 1837 Christian Ludwig Gerling, a former student of Carl Friedrich Gau{\ss}'s, organized the world wide first determination of the deflection of the vertical in longitude. From a mobile observatory at the Frauenberg near Marburg (Hesse) he measured the astronomical longitude difference between C.F. Gau{\ss}'s observatory at G\"ottingen and F.G.B. Nicolai's observatory at Mannheim within an error of 0.4". To achieve this precision he first used a series of light signals for synchronizing the observatory clocks and, second, he very carefully corrected for the varying reaction time of the observers. By comparing these astronomical results with the geodetic--determined longitude differences he had recently measured for the triangulation of Kurhessen, he was able to extract a combined value of the deflection of the vertical in longitude of G\"ottingen and Mannheim. His results closely agree with modern vertical deflection data.
]]></description>
<dc:subject>history-of-science philosophy-of-science astronomy rather-interesting engineering-design statistics</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:004e8e90bc5e/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:history-of-science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:philosophy-of-science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:rather-interesting"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:engineering-design"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:statistics"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1401.5794">
    <title>[1401.5794] Benford's Law and the Universe</title>
    <dc:date>2014-12-20T18:53:12+00:00</dc:date>
    <link>http://arxiv.org/abs/1401.5794</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Benford's law predicts the occurrence of the nth digit of numbers in datasets originating from various sources of the world, ranging from financial data to atomic spectra. It is intriguing that although many features of Benford's law have been proven and analysed, it is still not fully mathematically understood. In this paper we investigate the distances of galaxies and stars by comparing the first, second and third significant digit probabilities with Benford's predictions. It is found that the distances of galaxies follow reasonably well the first digit law and the star distances agree very well with the first, second and third significant digit.
]]></description>
<dc:subject>Bedford's-Law astronomy philosophy-of-science WTF-universe? probability-theory</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:6bf9a3435cb0/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Bedford's-Law"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:philosophy-of-science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:WTF-universe?"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:probability-theory"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1412.1840">
    <title>[1412.1840] A Novel, Fully Automated Pipeline for Period Estimation in the EROS 2 Data Set</title>
    <dc:date>2014-12-14T14:13:20+00:00</dc:date>
    <link>http://arxiv.org/abs/1412.1840</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[We present a new method to discriminate periodic from non-periodic irregularly sampled lightcurves. We introduce a periodic kernel and maximize a similarity measure derived from information theory to estimate the periods and a discriminator factor. We tested the method on a dataset containing 100,000 synthetic periodic and non-periodic lightcurves with various periods, amplitudes and shapes generated using a multivariate generative model. We correctly identified periodic and non-periodic lightcurves with a completeness of 90% and a precision of 95%, for lightcurves with a signal-to-noise ratio (SNR) larger than 0.5. We characterize the efficiency and reliability of the model using these synthetic lightcurves and applied the method on the EROS-2 dataset. A crucial consideration is the speed at which the method can be executed. Using hierarchical search and some simplification on the parameter search we were able to analyze 32.8 million lightcurves in 18 hours on a cluster of GPGPUs. Using the sensitivity analysis on the synthetic dataset, we infer that 0.42% in the LMC and 0.61% in the SMC of the sources show periodic behavior. The training set, the catalogs and source code are all available in this http URL
]]></description>
<dc:subject>signal-processing astronomy algorithms classification nudge-targets consider:rediscovery</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:da9fb09dea1b/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:signal-processing"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:algorithms"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:classification"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:consider:rediscovery"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1309.0790">
    <title>[1309.0790] SKYNET: an efficient and robust neural network training tool for machine learning in astronomy</title>
    <dc:date>2014-09-24T11:29:23+00:00</dc:date>
    <link>http://arxiv.org/abs/1309.0790</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[We present the first public release of our generic neural network training algorithm, called SkyNet. This efficient and robust machine learning tool is able to train large and deep feed-forward neural networks, including autoencoders, for use in a wide range of supervised and unsupervised learning applications, such as regression, classification, density estimation, clustering and dimensionality reduction. SkyNet uses a `pre-training' method to obtain a set of network parameters that has empirically been shown to be close to a good solution, followed by further optimisation using a regularised variant of Newton's method, where the level of regularisation is determined and adjusted automatically; the latter uses second-order derivative information to improve convergence, but without the need to evaluate or store the full Hessian matrix, by using a fast approximate method to calculate Hessian-vector products. This combination of methods allows for the training of complicated networks that are difficult to optimise using standard backpropagation techniques. SkyNet employs convergence criteria that naturally prevent overfitting, and also includes a fast algorithm for estimating the accuracy of network outputs. The utility and flexibility of SkyNet are demonstrated by application to a number of toy problems, and to astronomical problems focusing on the recovery of structure from blurred and noisy images, the identification of gamma-ray bursters, and the compression and denoising of galaxy images. The SkyNet software, which is implemented in standard ANSI C and fully parallelised using MPI, is available at this http URL
]]></description>
<dc:subject>deep-learning neural-networks algorithms machine-learning astronomy nudge-targets</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:6b6d1d2e78c1/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:deep-learning"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:neural-networks"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:algorithms"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:machine-learning"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1408.1206">
    <title>[1408.1206] Self-organized criticality in a spherically closed cellular automaton: Modeling soft gamma repeater bursts driven by magnetic reconnection</title>
    <dc:date>2014-08-17T13:00:45+00:00</dc:date>
    <link>http://arxiv.org/abs/1408.1206</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[A new cellular automaton (CA) model is presented for the self-organized criticality (SOC) in recurrent bursts of soft gamma repeaters (SGRs), which are interpreted as avalanches of reconnection in the magnetosphere of neutron stars. The nodes of a regular dodecahedron and a truncated icosahedron are adopted as spherically closed grids enclosing a neutron star. It is found that the system enters the SOC state if there are sites where the expectation value of the added perturbation is nonzero. The energy distributions of SOC avalanches in CA simulations are described by a power law with a cutoff, which is consistent with the observations of SGR 1806-20 and SGR 1900+14. The power-law index is not universal and depends on the amplitude of the perturbation. This result shows that the SOC of SGRs can be illustrated not only by the crust quake model but also by the magnetic reconnection model.
]]></description>
<dc:subject>cellular-automata astronomy simulation topology algorithms interesting</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:66e5e63427a4/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:cellular-automata"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:simulation"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:topology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:algorithms"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:interesting"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1309.2942">
    <title>[1309.2942] Galaxy mergers on a moving mesh: a comparison with smoothed-particle hydrodynamics</title>
    <dc:date>2013-09-16T23:32:54+00:00</dc:date>
    <link>http://arxiv.org/abs/1309.2942</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Galaxy mergers have been investigated for decades using smoothed particle hydrodynamics (SPH), but recent work highlighting inaccuracies inherent in the traditional SPH technique calls into question the reliability of previous studies. We explore this issue by comparing a suite of Gadget-3 SPH simulations of idealised (i.e., non-cosmological) isolated discs and galaxy mergers with otherwise identical calculations performed using the moving-mesh code Arepo. When black hole (BH) accretion and active galactic nucleus (AGN) feedback are not included, the star formation histories (SFHs) obtained from the two codes agree well. When BHs are included, the code- and resolution-dependent variations in the SFHs are more significant, but the agreement is still good, and the stellar mass formed over the course of a simulation is robust to variations in the numerical method. During a merger, the gas morphology and phase structure are initially similar prior to the starburst phase. However, once a hot gaseous halo has formed from shock heating and AGN feedback (when included), the agreement is less good. In particular, during the post-starburst phase, the SPH simulations feature more prominent hot gaseous haloes and spurious clumps, whereas with Arepo, gas clumps and filaments are less apparent and the hot halo gas can cool more efficiently. We discuss the origin of these differences and explain why the SPH technique yields trustworthy results for some applications (such as the idealised isolated disc and galaxy merger simulations presented here) but not others (e.g., gas flows onto galaxies in cosmological hydrodynamical simulations).
]]></description>
<dc:subject>simulation astronomy would-make-an-awesome-screensaver interesting nudge-targets towards-a-cosmological-engineering</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:01f3fd8a57dd/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:simulation"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:would-make-an-awesome-screensaver"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:interesting"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:towards-a-cosmological-engineering"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1211.6582">
    <title>[1211.6582] Emergence of large scale structure in planetary turbulence</title>
    <dc:date>2013-04-21T15:15:03+00:00</dc:date>
    <link>http://arxiv.org/abs/1211.6582</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[Planetary and magnetohydrodynamic drift-wave turbulence is observed to self-organize into large scale structures such as zonal jets and coherent vortices. In this Letter we present a non-equilibrium statistical theory, the Stochastic Structural Stability theory (SSST), that can make predictions for the formation and finite amplitude equilibration of non-zonal and zonal structures (lattice and stripe patterns) in homogeneous turbulence. This theory reveals that the emergence of large scale structure is the result of an instability of the interaction between the coherent flow and the associated turbulent field. Comparison of the theory with nonlinear simulations of a barotropic flow in a beta-plane channel with turbulence sustained by isotropic random stirring, demonstrates that SSST predicts the threshold parameters at which the coherent structures emerge as well as the characteristics of the emerging structures (scale, amplitude, phase speed). It is shown that non-zonal structures (lattice states or zonons) emerge at lower energy input rates of the stirring compared to zonal flows (stripe states) and their emergence affects the dynamics of jet formation.
]]></description>
<dc:subject>meteorology astronomy emergence nonlinear-dynamics fluid-dynamics pattern-formation</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:8e637892aa47/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:meteorology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:emergence"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nonlinear-dynamics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:fluid-dynamics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:pattern-formation"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://io9.com/5936271/and-now-a-video-of-2299-confirmed-exoplanets-orbiting-a-single-star">
    <title>And now, a video of 2,299 exoplanets orbiting a single star</title>
    <dc:date>2012-08-20T22:14:56+00:00</dc:date>
    <link>http://io9.com/5936271/and-now-a-video-of-2299-confirmed-exoplanets-orbiting-a-single-star</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["There are 2,299 exoplanets featured in the video up top, all of which have been discovered by NASA's Kepler spacecraft since 2009."]]></description>
<dc:subject>astronomy I-want-to-go-there visualization</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:870dbc74abac/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:I-want-to-go-there"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:visualization"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://spaceweather.com/archive.php?view=1&amp;day=21&amp;month=06&amp;year=2011">
    <title>Spaceweather.com Time Machine</title>
    <dc:date>2011-06-21T10:35:19+00:00</dc:date>
    <link>http://spaceweather.com/archive.php?view=1&amp;day=21&amp;month=06&amp;year=2011</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["SOLSTICE SOLARGRAPHS: Last December, the staff of the Philippus Lansbergen Observatory in Middelburg, the Netherlands, invited members of the general public to join them for a solargraph-making party. A solargraph is a simple pinhole camera made from a soda or beer can lined with a piece of photographic paper. About a 100 cans were deployed around the observatory and, six months later, here are the results:…"]]></description>
<dc:subject>solargraph astronomy photography project Making</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:a45de3e48385/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:solargraph"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:photography"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:project"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Making"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://www.pinholephotography.org/Solargraph%20instructions%202.htm">
    <title>6-month pinhole solargraph</title>
    <dc:date>2011-06-21T10:32:28+00:00</dc:date>
    <link>http://www.pinholephotography.org/Solargraph%20instructions%202.htm</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["Much of pinhole photography relates to the use of time and being creative with the light from the sun, similar wonders to that found in astronomy. A 6-month exposure will enable you to image the arc of the sun as it rises or sinks throughout 6 months of the year. As well as this you will get some foreground detail and a camera to look at with awe as a small hole etches its 6-month exposure from your window ledge, garden shed, lamp post, tree etc.

Being able to capture a period of time far beyond our own vision is incredible enough, but even more amazing is how simple it is to do. The final camera gives an extreme wide angle of view of 160 degrees."]]></description>
<dc:subject>astronomy photography Making long-now</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:e24ff15a8479/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:photography"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Making"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:long-now"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://www.space.com/11907-mars-history-martian-illusions-human-delusions.html">
    <title>Seeing Things On Mars: A Long History of Martian Illusions and Human Delusions |Pareidolia &amp; Optical Illusions | Space.com</title>
    <dc:date>2011-06-10T12:44:49+00:00</dc:date>
    <link>http://www.space.com/11907-mars-history-martian-illusions-human-delusions.html</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["Humans have been seeing strange things on the surface of Mars for centuries. From the 1700s up through the present day, widespread fame has been available to anyone able to produce even the slightest bit of flimsy evidence that there's Martian life."]]></description>
<dc:subject>nanohistory Mars psychoceramics astronomy belief optical-illusions</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:Vaguery/b:f1b64f5b229b/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nanohistory"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Mars"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:psychoceramics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:belief"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:optical-illusions"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1006.4354">
    <title>[1006.4354] Empirical Modeling of Radiative versus Magnetic Flux for the Sun-as-a-Star</title>
    <dc:date>2010-06-28T22:21:51+00:00</dc:date>
    <link>http://arxiv.org/abs/1006.4354</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["…We find that a well-defined temporal component exists and accounts for some of the variance in the data. This temporal component arises because active regions with high magnetic field strength evolve, breaking up into small-scale magnetic elements with low field strength, and radiative and magnetic fluxes are sensitive to different active-region components. We generate empirical models that relate radiative flux to magnetic flux, allowing us to predict spectral-irradiance variations from observations of disk-averaged magnetic-flux density. In most cases, the model reconstructions can account for 85-90% of the variability of the radiative flux from the chromosphere and corona. Our results are important for understanding the relationship between magnetic and radiative measures of solar and stellar variability."
]]></description>
<dc:subject>astronomy astrophysics modeling learning-from-data statistics nudge-targets</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:458f43777eae/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astrophysics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:modeling"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:learning-from-data"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:statistics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1005.5636">
    <title>[1005.5636] Astrocladistics: Multivariate Evolutionary Analysis in Astrophysics</title>
    <dc:date>2010-06-19T13:41:20+00:00</dc:date>
    <link>http://arxiv.org/abs/1005.5636</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["It is now clear that cladistics can be applied and be useful to the study of galaxy diversification. Many difficulties, conceptual and practical, have been solved,. Significant astrophysical results have been obtained and will be extended to larger samples of galaxies and globular clusters. However, many paths remain in the exploration of this new and large field of research."
]]></description>
<dc:subject>astronomy classification cladistics inference nudge-targets learning-from-data model-discovery</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:26a63d454c22/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:classification"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:cladistics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:inference"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:learning-from-data"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:model-discovery"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1005.1527">
    <title>[1005.1527] Observing stellar bow shocks</title>
    <dc:date>2010-05-11T14:24:02+00:00</dc:date>
    <link>http://arxiv.org/abs/1005.1527</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["… Here we discuss some literature on stellar bow shocks and show observations of some of them, enhanced by image processing techniques, in particular by the recently proposed AstroFracTool software."
]]></description>
<dc:subject>astronomy nudge-targets image-processing image-analysis</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:5127517a1d88/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:image-processing"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:image-analysis"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1001.5210">
    <title>[1001.5210] Supernova Photometric Classification Challenge</title>
    <dc:date>2010-03-28T14:57:04+00:00</dc:date>
    <link>http://arxiv.org/abs/1001.5210</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["The goals of this challenge are to (1) learn the relative strengths and weaknesses of the different classification algorithms, (2) use the results to improve classification algorithms, and (3) understand what spectroscopically confirmed sub-sets are needed to properly train these algorithms. The challenge is available at www.hep.anl.gov/SNchallenge, and the due date for classifications is May 1, 2010."
]]></description>
<dc:subject>classification learning-from-data modeling challenges astronomy statistics nudge nudge-targets</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:7acd31c02ea5/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:classification"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:learning-from-data"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:modeling"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:challenges"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:statistics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:nudge-targets"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/1003.4002">
    <title>[1003.4002] Spectral Classification; Old and Contemporary</title>
    <dc:date>2010-03-23T22:49:25+00:00</dc:date>
    <link>http://arxiv.org/abs/1003.4002</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["Beginning with a historical account of the spectral classification, its refinement through additional criteria is presented. The line strengths and ratios used in two dimensional classifications of each spectral class are described. A parallel classification scheme for metal-poor stars and the standards used for classification are presented. The extension of spectral classification beyond M to L and T and spectroscopic classification criteria relevant to these classes are described. Contemporary methods of classifications based upon different automated approaches are introduced."
]]></description>
<dc:subject>machine-learning learning-from-data science2.0 Nudge clustering statistics astronomy digitization</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:44a450668e37/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:machine-learning"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:learning-from-data"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:science2.0"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Nudge"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:clustering"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:statistics"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:digitization"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://science.nasa.gov/headlines/y2010/17feb_3dsun.htm">
    <title>NASA - 3D Sun for the iPhone</title>
    <dc:date>2010-03-22T20:40:38+00:00</dc:date>
    <link>http://science.nasa.gov/headlines/y2010/17feb_3dsun.htm</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["February 17, 2010: Imagine holding the entire sun in the palm of your hand. Now you can. A new iPhone app developed by NASA-supported programmers delivers a live global view of the sun directly to your cell phone. Users can fly around the star, zoom in on active regions, and monitor solar activity.

"This is more than cool," says Dick Fisher, director of NASA's Heliophysics Division in Washington DC. "It's transformative. For the first time ever, we can monitor the sun as a living, breathing 3-dimensional sphere.""
]]></description>
<dc:subject>NASA astronomy solar-exploration iPgibw iPhone</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:8abf2a4950e7/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:NASA"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:solar-exploration"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:iPgibw"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:iPhone"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://arxiv.org/abs/0910.3989">
    <title>[0910.3989] Naming the extrasolar planets</title>
    <dc:date>2009-11-11T21:12:24+00:00</dc:date>
    <link>http://arxiv.org/abs/0910.3989</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["Extrasolar planets are not named and are referred to only by their assigned scientific designation. The reason given by the IAU to not name the planets is that it is considered impractical as planets are expected to be common. I advance some reasons as to why this logic is flawed, and suggest names for the 403 extrasolar planet candidates known as of Oct 2009. The names follow a scheme of association with the constellation that the host star pertains to, and therefore are mostly drawn from Roman-Greek mythology. Other mythologies may also be used given that a suitable association is established."
]]></description>
<dc:subject>astronomy science-fiction naming conventions cultural-norms</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:7202009bbc60/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:science-fiction"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:naming"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:conventions"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:cultural-norms"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://bayes.wordpress.com/2009/01/15/its-the-freakiest-show/#comment-8604">
    <title>It’s the Freakiest Show « Quantum of Wantum</title>
    <dc:date>2009-01-16T16:43:28+00:00</dc:date>
    <link>http://bayes.wordpress.com/2009/01/15/its-the-freakiest-show/#comment-8604</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA["Or the methane could be produced by some kind of Martian cows, buried no doubt. On Earth each Earth-type cow produces .6 metric tons of methane annually. One of the comments to yesterday’s NASA press conference on this discovery pointed out that since the plume contained about 19,000 tons of CH4 that indicates (if Martian cows are similar to Earth cows) that we should be looking for about 19,000/.6 = 31,000 (hidden or buried) Martian cows. This possibility will probably be reported on extensively in supermarket publications over the next several weeks."
]]></description>
<dc:subject>Mars areology astrobiology chemistry astronomy methane</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:fd93d43257c3/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Mars"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:areology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astrobiology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:chemistry"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:methane"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://www.inquinamentoluminoso.it/dmsp/artbri.html">
    <title>The night sky in the World- Pierantonio Cinzano Web pages</title>
    <dc:date>2008-06-07T13:46:47+00:00</dc:date>
    <link>http://www.inquinamentoluminoso.it/dmsp/artbri.html</link>
    <dc:creator>Vaguery</dc:creator><dc:subject>astronomy light pollution quality-of-life stars development</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:43bf4131f039/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:light"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:pollution"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:quality-of-life"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:stars"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:development"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://www.spitzer.caltech.edu/Media/releases/ssc2008-10/release.shtml">
    <title>Press Release: Two of the Milky Way's Spiral Arms Go Missing</title>
    <dc:date>2008-06-07T12:52:25+00:00</dc:date>
    <link>http://www.spitzer.caltech.edu/Media/releases/ssc2008-10/release.shtml</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[You mean all my old Traveller maps are wrong now?
]]></description>
<dc:subject>astronomy galaxy science geography</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:ac9721a6d212/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:galaxy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:geography"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://pruned.blogspot.com/2008/02/titanic-lakes.html">
    <title>Pruned: Titanic Lakes</title>
    <dc:date>2008-02-26T11:24:17+00:00</dc:date>
    <link>http://pruned.blogspot.com/2008/02/titanic-lakes.html</link>
    <dc:creator>Vaguery</dc:creator><dc:subject>astronomy planetology Titan image maps art that-gilded-land-with-its-lapis-lakes</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:7e5e13c1e35d/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:planetology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Titan"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:image"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:maps"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:art"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:that-gilded-land-with-its-lapis-lakes"/>
</rdf:Bag></taxo:topics>
</item>
<item rdf:about="http://science.nasa.gov/headlines/y2008/30jan_mercurysurprise.htm?list214102">
    <title>NASA - Surprises from Mercury</title>
    <dc:date>2008-01-31T01:39:39+00:00</dc:date>
    <link>http://science.nasa.gov/headlines/y2008/30jan_mercurysurprise.htm?list214102</link>
    <dc:creator>Vaguery</dc:creator><description><![CDATA[So it begins. We know where the Shadows lie.
]]></description>
<dc:subject>NASA Mercury planetology science astronomy space-exploration Babylon-5</dc:subject>
<dc:identifier>https://pinboard.in/u:Vaguery/b:ff773804598e/</dc:identifier>
<taxo:topics><rdf:Bag>	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:NASA"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Mercury"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:planetology"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:science"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:astronomy"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:space-exploration"/>
	<rdf:li rdf:resource="https://pinboard.in/u:Vaguery/t:Babylon-5"/>
</rdf:Bag></taxo:topics>
</item>
</rdf:RDF>