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A month has about 30 days because the months are set up to approximately match the moon's cycles but to complete a eyar evenly in 12 months.

Some motths have 30 days and some have 31 becasue the total for the year needs to add up to 365. August ought to have 30 days, but the month is named for the Roman Emperor Augustus and he insisted that "his" month be no less than July, the month named for Julius Caesar. So August has 31 days and the extra day was taken from February, which was already a bit short .

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7y ago

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