Tuesday, September 22, 2009

Happy Autumnal Equinox!

The fall season has officially begun here in California. The autumnal equinox in the northern hemisphere will happen today at 2:18 pm (pacific). The equinox is the exact time when the sun is directly over the equator and the earth’s axis is not tilted toward or away from the sun.

It’s not quite true that the equinox is 12 hours of day/12 hours of night. For instance here in Oakland the length of day today will be 12 hours 8 minutes. Further north in Eureka, Montana (hi Aunt Kris!) the length of day will be 12 hours 10 minutes, and further south in Oceanside, California (hi Grandma!) it will be 12 hours 7 minutes.

For a more in-depth explanation check out timeanddate.com.

(Photo: Poison oak in it’s fall disguise at Mount Diablo State Park. © R. Bond 2009.)