For example: the autumnal equinox was yesterday, but meteorological autumn starts September 1st. Why the disconnect?
In: Planetary Science
The first day of the season is based on the calendar date. It’s always the 21st. The equinox/solstice is based on astronomical factors, and might vary by a day or two from the “official” first day of a season.
It’s the same reason why we have leap years: the earth’s orbit isn’t exactly 365 days.
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