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Cusp of Summer

2009/06/19 By 2 Comments

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  1. eadwacer says:
    2009/06/19 at 11:05 pm

    My favorite astronomy moment is actually two: (1) when you see a half moon at dawn, and (2) when you see a half moon at sunset.

    Since it’s dawn/sunset, you are standing on the terminator. Since it’s a half moon, you are looking directly at the terminator. That means the moon is directly ahead/behind the earth. Four hours from now/four hours ago, the earth will be / was where the moon is now.

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  2. Kurt says:
    2009/09/25 at 4:27 pm

    I’ll do this with the kids–at least, the sunset termination.

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