For most people in the Northern Hemisphere, the official "first day" of a season follows the astronomical calendar, though weather experts use fixed monthly dates for better data tracking. Time and Date Astronomical (Sun Position) Meteorological (Calendar) March 20 – June 20 March 1 – May 31 June 21 – Sept 21 June 1 – August 31 Sept 22 – Dec 20 Sept 1 – Nov 30 Dec 21 – March 19 (2027) Dec 1 – Feb 28 (2027) Why Two Different Systems?
Each astronomical season runs from one event to the next:
These are based on the Earth’s position relative to the sun. They are defined by solstices (the longest and shortest days) and equinoxes (when day and night are roughly equal).
This method is based on the Earth's tilt and its orbit around the Sun. The dates change slightly every year because the Earth's orbit is not exactly 365 days. The seasons are defined by (longest/shortest days) and Equinoxes (equal day and night).
For most people in the Northern Hemisphere, the official "first day" of a season follows the astronomical calendar, though weather experts use fixed monthly dates for better data tracking. Time and Date Astronomical (Sun Position) Meteorological (Calendar) March 20 – June 20 March 1 – May 31 June 21 – Sept 21 June 1 – August 31 Sept 22 – Dec 20 Sept 1 – Nov 30 Dec 21 – March 19 (2027) Dec 1 – Feb 28 (2027) Why Two Different Systems?
Each astronomical season runs from one event to the next:
These are based on the Earth’s position relative to the sun. They are defined by solstices (the longest and shortest days) and equinoxes (when day and night are roughly equal).
This method is based on the Earth's tilt and its orbit around the Sun. The dates change slightly every year because the Earth's orbit is not exactly 365 days. The seasons are defined by (longest/shortest days) and Equinoxes (equal day and night).
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