<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/ca704374-87d5-46b2-912c-586bb9868c8c/206BF084-67F9-4ED9-BC4D-414896172F5F/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://antwrp.gsfc.nasa.gov/apod/ap090417.html" href="http://antwrp.gsfc.nasa.gov/apod/ap090417.html" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap090417.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/7ECA5471-2906-47F0-B4E0-7A4AE2DD9E5E" alt="See Explanation. Clicking on the picture will download the highest resolution version available." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap090417.html"><P> <B> Explanation: </B> Discovered by accident, this manuscript page provides graphical insight to astronomy in medieval times, before the <A href="http://www.spacetoday.org/History/MillenniumTimeline/ 16thCentury.html" linkindex="5">Renaissance</A> and the influence of <A href="http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/ Copernicus.html" linkindex="6">Nicolaus Copernicus</A>, <A href="http://antwrp.gsfc.nasa.gov/apod/ap010107.html" linkindex="7">Tycho de Brahe</A>, <A href="http://antwrp.gsfc.nasa.gov/apod/ap970913.html" linkindex="8">Johannes Kepler</A>, and <A href="http://en.wikipedia.org/wiki/Galileo_Galilei" linkindex="9">Galileo</A>. The intriguing page is from lecture notes on astronomy compiled by the monk Magister Wolfgang de Styria before the year 1490 at Melk Abbey in Austria. The top panels clearly illustrate the necessary geometry for a lunar (left) and solar eclipse in the Earth-centered <A href="http://www.windows.ucar.edu/tour/link=/people/ancient_epoch/ ptolemy.html" linkindex="10">Ptolemaic system</A>. At lower left is a diagram of the <A href="http://csep10.phys.utk.edu/astr161/lect/retrograde/ aristotle.html" linkindex="11">Ptolemaic view</A> of the solar system and at the lower right is a chart to calculate the <A href="http://antwrp.gsfc.nasa.gov/apod/ap090416.html" linkindex="12">date</A> of Easter Sunday in the <A href="http://antwrp.gsfc.nasa.gov/apod/ap040229.html" linkindex="13">Julian</A> calendar. Text at the upper right explains the <A href="http://astro.unl.edu/naap/ssm/animations/ptolemaic.swf" linkindex="14">movement of the planets</A> according to the Ptolemaic system. The actual manuscript page is on view at historic <A href="http://www.stiftmelk.at/" linkindex="15">Melk Abbey</A> as part of a <A href="http://www.astronomie2009.at/kalender/ termin-anzeige.php?terminId=524" linkindex="16">special exhibition</A> during the <A href="http://www.iya2009.org/" linkindex="17">International Year of Astronomy</A>. </P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/206BF084-67F9-4ED9-BC4D-414896172F5F/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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