the moon is very much close to earth compare to the sun

the moon is very much close to earth compare to the sun

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送交者: meiyou 于 2009-03-25, 15:07:09:

回答: 怕的就是观测到的月球影子在地面的移动速度取决于月亮到地球的距离由 HunHunSheng 于 2009-03-25, 14:56:29:

treat sun light as parallel light in this case

你要测量的是日蚀还是月蚀的时候月亮的影子？ (无内容) - HunHunSheng (0 bytes) 2009-03-25, 15:14:33 (309082)
- I had a TYPO should be 日蚀 (无内容) - meiyou (0 bytes) 2009-03-25, 15:16:34 (309083)