古观象台, 2/1999
天文是农业文明的立国之本，譬如这个台子，始建於元代。台子上的东西当然要更早，典型的工具如日晷，可以仅凭太阳的位置确定时间。……什么？为什么是方的？日晷确实有方的，倒是没见过方的『缶』……
Astronomy is the base of the agriculture civilizations. This station built by our ancestors since Yuan Destiny for example. There're many utilities invented before, such as Sundial here, can get current time just from the position of the sun.
日晷 Sundial - 古观象台, 2/1999
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