Time from the Moon

The phase of the moon gives a clue to the time of day. A full moon is seen when the moon is on the opposite side of the earth from the sun, so the moon rises just as the sun

10.8 One Second Pendulum

sets, and sets as the sun rises. The next day, the moon will rise approximately 50 minutes later (because the moon has moved farther along on its orbit). A waning half moon rises at midnight, and a new moon at dawn. The moon moves about one of its diameters an hour. Knowing this and the time when it rose, it is possible to work out the time of night.

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