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The astronomical start date isn't fixed because the Earth's orbit isn't exactly 365 days. While it usually falls on September 22 or 23, it can occasionally land anywhere between September 21 and 24. In 2025, the equinox occurs on . Seasonal Traditions & Vibes Autumn Equinox: The Astronomy Behind Fall's First Day
The answer to "when is autumn" depends on which definition is used: the astronomical calendar (based on the position of the Earth relative to the Sun) or the meteorological calendar (based on annual temperature cycles). when is the autumn
The timing of autumn drives many cultural events: The astronomical start date isn't fixed because the
2. When is the autumn equinox? When the autumn equinox falls will depend on whether you're in the northern or southern hemisphere. Insight Vacations First Signs of Autumn – What to Look For - Woodland Trust Seasonal Traditions & Vibes Autumn Equinox: The Astronomy
Most people will give you the calendar answer: (in the Northern Hemisphere) or March 20 or 21 (in the Southern Hemisphere).