answersLogoWhite

0

September 22-23 & March 21-22. They mark the beginnings of autumn and spring respectively, in the northern hemisphere. They mark the beginnings of spring and autumn, respectively, in the Southern Hemisphere.
The Spring equinox and the Autumnal equinox occur when the length of daytime and the length of nighttime are exactly equal to each other.

User Avatar

Wiki User

8y ago

What else can I help you with?