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Spring Equinox – Vernal Equinox

The spring (vernal) equinox in the Northern Hemisphere is the autumnal (fall) equinox in the Southern Hemisphere and vice versa.

Equinox and solstice illustration
Equinoxes and solstices happen twice a year.
Equinoxes and Solstices are opposite on either side of the equator. (Ill. not to scale)

When is the equinox in my city?

On the two equinoxes every year the sun shines directly on the equator and the length of day and night is nearly equal – but not quite.

Northern Hemisphere spring equinox

March equinox 2015: March 20, at 22:45 UTC.

(USA, Central America, Canada, Europe, Asia, northern Africa)

Southern Hemisphere spring equinox

September equinox 2015: September 23, at 08:20 UTC.

(Australia, New Zealand, South America, Southern Africa)

First day of spring?

In the northern hemisphere, the fall equinox marks the first day of fall (autumn) in what we call astronomical seasons. There's also another, more common definition of when the seasons start, namely meteorological definitions, which are based on average temperatures rather that astronomical events.

Topics: Astronomy, Seasons, March, September, Sun, Earth, Calendar, Southern Hemisphere, Northern Hemisphere

In this Article

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Equinox & Solstice

  1. March Exquinox
  2. When is the Spring Equinox?
  3. Nearly Equal Night & Day
  4. 10 Facts: March Equinox
  5. June Solstice
  6. Summer Solstice
  7. September Equinox
  8. Autumnal Equinox
  9. December solstice
  10. Winter Solstice

Equinox & Solstice in Culture


Astronomical Season Calculator

Sunrise & Sunset times

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