<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/6d504b88-d418-4a73-9e62-ff3a38018d14/4D4F26F1-1E92-4C10-B8CA-E1F6DBFDCC23/" 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/ap090619.html" href="http://antwrp.gsfc.nasa.gov/apod/ap090619.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/ap090619.html"><H1> Astronomy Picture of the Day </H1></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/ap090619.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/4DCAC76E-2529-4CB2-9104-2B44085D4166" 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/ap090619.html"><B>Explanation: </B> This ancient Chinese map of planet Earth's northern sky is part of the Dunhuang Star Atlas, one of the most impressive documents in the <A href="http://en.wikipedia.org/wiki/ Timeline_of_Chinese_astronomy">history of astronomy</A>. The oldest complete star atlas known, it dates to the years 649 to 684, discovered at the <A href="http://antwrp.gsfc.nasa.gov/apod/ap080831.html">Silk Road</A> town of Dunhuang in 1907. <A href="http://arxiv.org/abs/0906.3034">A recent analysis</A> that examines the accuracy and projections used to make it notes the atlas marks positions of over 1,300 stars and outlines 257 Chinese <A href="http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/ e_research_chinengstarzone.htm">star groups or asterisms</A>. The star positions in the hand drawn atlas were found to be accurate to within a few degrees. In this example showing the north polar region, a very recognizable <A href="http://antwrp.gsfc.nasa.gov/apod/ap070108.html">Big Dipper</A>, part of the modern constellation Ursa Major, lies along the bottom of the chart. An additional 12 charts depict equatorial regions in 30 degree sections and also include a grouping resembling the modern constellation <A href="http://antwrp.gsfc.nasa.gov/apod/ap030207.html">Orion</A>.</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/4D4F26F1-1E92-4C10-B8CA-E1F6DBFDCC23/blog/" title="blog or email this clip"><img src="http://content7.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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