送交者: Enlighten 于 2005-1-12, 17:25:40:
回答: 色耶尼城市在亚历山大城的正南方 ensure the two cities's noon are simultaneous 由 HunHunSheng 于 2005-1-12, 17:15:26:
it should be on the "same plane". It's not a matter of time, but a matter of using the right distance and angle.