| Topic | Author | Replies | Last Post |
|---|---|---|---|
| Aurora |
 Serge
|
4 | Yesterday, 12:25 PM |
| As the World Churns |
Serge
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1 | December 22, 2009 |
| "JPL on the Go!" |
Serge
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0 | December 22, 2009 |
| Eyes in the Sky II Seeks Grade 9 to 12 Science Teachers |
Serge
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0 | December 22, 2009 |
| East Coast Blizzard 2009 |
eric
|
3 | December 21, 2009 |
Gaocheng, China
the country's oldest surviving observatory. Built in Henan Province around 1276 by renowned Chinese astronomer and engineer Guo Shoujing, it was used for time-keeping and mapping the stars.
"Guo Shoujing was doing the best astronomy in the world at the time," says Krupp.
www.newscientist.com/gallery...tories/3
"Guo Shoujing was doing the best astronomy in the world at the time," says Krupp.
www.newscientist.com/gallery...tories/3
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