s*****t
发帖数: 1994 | 1 Beijing Ancient Observatory
Credit & Copyright: Judy Tobin
Explanation: Did observatories exist before telescopes? One example that still stands today
is the Beijing Ancient Observatory in China. Starting in the 1400s astronomers erected large
instruments here to enable them to measure star and planet positions with increasing
accuracy. Pre-telescopic observatories throughout the world date back to before recorded
history, providing measurements that helped to determine when | s*****t
发帖数: 1994 | 2 The one taken in 1895:
【在 s*****t 的大作中提到】
: Beijing Ancient Observatory
: Credit & Copyright: Judy Tobin
: Explanation: Did observatories exist before telescopes? One example that still stands today
: is the Beijing Ancient Observatory in China. Starting in the 1400s astronomers erected large
: instruments here to enable them to measure star and planet positions with increasing
: accuracy. Pre-telescopic observatories throughout the world date back to before recorded
: history, providing measurements that helped to determine when
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