Days are based of where the earth is facing during it’s spin
Years are based on rotations around the sun
Seasons are based on which side of the earth is facing the sun or not
But months and weeks are just abstract concepts with nothing to compare it to
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Months are pretty close to the Moon’s orbital period. Weeks, though, are totally arbitrary.
If you consider a lunar month, weeks are phases: waxing crescent, waxing gibbous, waning gibbous, waning crescent.
