Just for fun.
This is the day you have exactly the same number of hours of daylight as dark. You will be able for the next few hours to stand and balance a raw egg on the large end (must be on a flat level surface). It will stand by itself until about daylight tomorrow then fall over.
Old wives tale. You can balance an egg any day of the year, equinox, solstice, eclipse, President's Day, my birthday, your birthday, doesn't matter. see
http://apod.nasa.gov/apod/ap030923.html and many others.
Just a Shooter (and occasional science nerd)