http://wiki.china.org.cn/index.php?action=history&feed=atom&title=Guo_ShoujingGuo Shoujing - Revision history2026-04-24T22:36:04ZRevision history for this page on the wikiMediaWiki 1.34.2http://wiki.china.org.cn/index.php?title=Guo_Shoujing&diff=23317&oldid=previmported>Ciic at 02:05, 24 March 20102010-03-24T02:05:42Z<p></p>
<p><b>New page</b></p><div>In 1279, the astronomer '''Guo Shoujing''' (1231-1316) devised a number of astronomical instruments, including the armillary sphere and celestial body, and used them to conduct a series of large-scale geodetic surveys and celestial observations in 27 places in [[China]]. According to the results of his observations, Guo formulated the [[Shoushi Calendar]], which became the most advanced calendar of that time, and used for the longest time. He calculated a solar year to be 365.2425 days, the same as the Gregorian calendar. <br />
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[[File:Model of Guo Shoujing's abridged armillary sphere.jpg|thumb|Model of Guo Shoujing's abridged armillary sphere]]<br />
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