251

This number is a prime.

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The Moon not only changes phases from lunation to lunation but changes in size as the Moon moves closer to and farther away from the Earth. The length of 18 fumocies is almost exactly equal to the length of 251 lunations. [Engel]

Submitted: 2005-11-22 16:01:59;   Last Modified: 2009-04-25 17:51:23.
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