Overview
Autumn (年, aki) is one of the four seasons and is located after summer and before winter.
In socially accepted ideas and meteorology, it is the period of September, October, and November.
In the calendar, it refers to the period from the first day of autumn to the day before the first day of winter (from July to September in the lunar calendar).
In astronomy, it is from the autumnal equinox to the winter solstice.
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