first two are not as difficult as you thought
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送交者: sohu 于 2009-03-25, 15:47:10:
回答: 这就是直接三角视差法嘛 由 刚柔 于 2009-03-25, 15:32:10:
telesope could handle that kind of angle in that time
taking a remote star as a common reference in night
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