
Equinox! What does it mean? Well, the term is from Latin and it means "equal night."
Further definition comes from Infoplease:
"In the language of science, an equinox is either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. For the rest of us, it's one of two times a year when the Sun crosses the equator, and the day and night are of approximately equal length.
At the autumnal equinox (Sept 22, 2008; 11:44:18 A.M. EDT), the Sun appears to cross the celestial equator, from north to south; this marks the beginning of autumn in the Northern Hemisphere."
Here are some other websites that explain all about the Autumnal Equinox.
"The Autumnal Equinox" Infoplease
Fall Equinox Celebrations
The First Day of Autumn
National Weather Service: Why Do We Have Seasons?
Seasons of the Year
Interplanaetary Fall


