Autumnal Equinox – Fall Equinox
Equinoxes are opposite on either side of the equator, so the autumnal (fall) equinox in the Northern Hemisphere is the spring (vernal) equinox in the Southern Hemisphere and vice versa.
Autumnal Equinox, Southern Hemisphere
(Australia, New Zealand, South America, Southern Africa)
Autumnal (Fall) Equinox, Northern Hemisphere
(USA & Central America, Asia, Canada, Europe, Northern Africa)
Not Entirely Equal Day & Night
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 exactly.
Equinox the First Day of Fall?
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.
In this Article
- Autumnal Equinox, Southern Hemisphere
- Autumnal (Fall) Equinox, Northern Hemisphere
- Not Entirely Equal Day & Night
- Equinox the First Day of Fall?
Equinox & Solstice
- Nearly Equal Night & Day
- March Equinox
- 10 Facts: March Equinox
- Vernal (Spring) Equinox
- Customs Around March Equinox
- September Equinox
- Autumnal (Fall) Equinox
- 10 Facts: September Equinox
- Customs: September Equinox
- June Solstice
- Customs Around June Solstice
- Summer Solstice
- December Solstice
- Winter Solstice