When Does Spring Start?
The first day of spring is at the vernal equinox, when day and night are equal. Find out the exact time and date.
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Home Sun, Moon & Space Seasons
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Countries define seasons differently. This calculator refers to astronomical seasons, not meteorological seasons.
The Seasons Calculator shows the times and dates of Vernal (Spring) & Autumnal (Fall) equinoxes and Summer and Winter solstices all over the world.
Learn more about equinoxes and solstices
When Does Summer Start?
Find out the exact moment of the summer solstice in both the Northern and Southern Hemispheres—down to the minute.
When Does Fall Start?
North of the equator, fall begins in September. Find out the exact dates for both hemispheres.
When Does Winter Start?
The first day of winter in the Northern Hemisphere is in December; south of the equator, it is in June. Find out exactly when the winter season starts.
March Equinox
At the March equinox, the Sun crosses the equator from south to north. Explanation and 2026 equinox date.
June Solstice 2025
The June solstice is the longest day of the year in the Northern Hemisphere and the shortest day in the Southern Hemisphere.
September Equinox
The Sun shines directly on the Equator on the September equinox and the length of day and night is nearly equal, but not quite.
December Solstice
December solstice marks the shortest day north of the equator and the longest day in the south.
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Astronomy Calculators
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- Moon Phase Calendar – Calculate moon phases for any year
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- Day and Night World Map – See which parts of the Earth are currently illuminated by the Sun.
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Calendar Tools
- Calendar for 2025 – Calendar with holidays for this year
- Calendar Generator – Create a calendar for any year
- Duration Between Two Dates – Calculates number of days
Related Time Zone Tool
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