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why does the moon have nights that are 14 days long?
Because it's period of rotation on its own axis is about 28 days. There is no "dark side", there's a side which is not visible from earth due to tidal lock, but the sun sees all parts of the moon as it revolves on its axis.
XKCD explained it all only yesterday:
gbj_tester
If the moon is tidally locked (and I've no compelling evidence otherwise) then why does the moon have nights that are 14 days long?