The long, hot summer of 2012 will finally end tomorrow at 9:49am CDT when the Autumnal Equinox arrives.   So basically there are only two days when the sun crosses the equator.  One is the Vernal Equinox or first day of spring and the other is the Autumnal Equinox marking the first day of autumn. The word "equinox" is a Latin word meaning "equal night".  Basically, there will be equal amounts of time for darkness of night and light of day on those two days. So fall will begin in the Northern Hemisphere and spring will start in the Southern Hemisphere at 9:49am our time.

There is also the folklore legend that says you can balance an egg on its end because the Earth's gravitational pull is supposedly balanced equally during an equinox time period. I have never been able to do that in the few attempts I have tried over the years but I will try it tomorrow just for fun. Try it yourself and let me know if it works. Square eggs are not allowed! The earth may be balanced but I'm not!