: why are some months 31 days or 30 days and why can’t they all be the same.
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Because there are 365 (and roughly a quarter, which is taken care of by leap year) solar days (amount of time the earth spins once on it’s axis) in a solar year (the amount of time earth rotates once around the sun). 365 factors into the prime numbers 5 and 73. So the only way to have the same number of days in a month is to have 5 months that are 73 days long each or 73 months that are 5 days each.
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