The druid, the weather presenter and the astronomer - when does autumn start?

The astronomical autumn begins on September 22 or 23 in the Northern Hemisphere, when the autumnal equinox occurs and day and night are approximately equal length. The meteorological autumn begins on September 1 in the Northern Hemisphere, a date used by meteorologists and weather services to align seasonal data with temperature patterns. Some observers, including certain Celtic and pagan traditions, mark autumn's start on Samhain, which falls on November 1 in the traditional calendar.

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