How is Autumn Equinox calculated?

This event is based on the astronomical moment when the Sun crosses the celestial equator heading southward each year.

When is Autumn Equinox 2357?

Monday, 23 September 2357

Autumn Equinox marks the astronomical point when the Sun crosses the celestial equator heading southward, signalling the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.

Also known as

Autumnal Equinox
Southward Equinox

Add to your calendar

Download an iCalendar file for Autumn Equinox and add it to your calendar app.

Add to calendar

Frequently asked questions

When is Autumn Equinox 2357?: Autumn Equinox 2357 is on Monday, 23 September 2357.
What day of the week is Autumn Equinox 2357?: It falls on Monday.
How is Autumn Equinox calculated?: This event is based on the astronomical moment when the Sun crosses the celestial equator heading southward each year.