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Math Help - if the moon is a full moon when it rises in the evening, which of the phases will it?

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    Question if the moon is a full moon when it rises in the evening, which of the phases will it?

    if the moon is a full moon when it rises in the evening, which of the phases (shown below A-H) will it be when it sets?

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    Forum Admin topsquark's Avatar
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    Quote Originally Posted by benjixbunn View Post
    if the moon is a full moon when it rises in the evening, which of the phases (shown below A-H) will it be when it sets?

    Which phase corresponds to a full moon? There's no reason for it to change over night.

    -Dan
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    So its "D"?

    thats what i thought,

    thanks!
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    Technically, the moon is full for only an instant. It's hard to say whether 12 hours may be considered enough time for the phase to have changed.
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    Quote Originally Posted by benjixbunn View Post
    if the moon is a full moon when it rises in the evening, which of the phases (shown below A-H) will it be when it sets?

    It will be technically full for an instant, to the casual observer it will still be full 12 hours later. To the careful observer it may be noticeable that it is not full, but which edge is in shadow depends on where you view from and your orientation. The series of diagrams presented correspond approximately to the view from a pole, and which direction is waxing/waning depends on which pole.

    CB
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