When Does the Equinox Occur?

The equinox occurs twice a year when the sun is directly above the equator. At this point the hours of darkness and hours of daylight are equal in length giving rise to the name "equinox" from the two Latin words "aequus" meaning equal and "nox" meaning night.

What Is the Equinox?

Although the equinox is generally referred to by the day, it is actually the moment the sun crosses the celestial equator.

Vernal Equinox

The vernal equinox occurs on March 20 or March 21 depending on the year, and marks the beginning of spring in the northern hemisphere.

Autumal Equinox

The autumnal equinox occurs on September 22 or September 23 and marks the beginning of fall in the northern hemisphere.

Balancing Eggs on Vernal Equinox

There is no scientific evidence that eggs balance on end at the moment of the vernal equinox. This belief is held by many and promoted by media each year.

Vernal Equinox Determines the Date of Easter

Easter is celebrated the first Sunday after the first full moon that occurs after the vernal equinox.

Resources

• Science World
• Balancing Eggs?