送交者: HunHunSheng 于 2005-1-12, 17:34:21:

回答: 测量最短距离,就保证它是夏至中午,当然还要测出两地连线和这时影子的角度. 由 wangle 于 2005-1-12, 17:32:21:

• It is still possilbe to get simultaneity if you really want it - wasguru (105 bytes) 2005-1-12, 21:29:41

加跟贴