So you people proved that you are well-read in the classics, with three of you successfully identifying an obscure Macbeth reference in one of Monday's posts. Now let's test your scientific acumen.
Today marks the autumnal equinox for 2010. Without Googling it or otherwise cheating, what is the significance of this point? What does it mean? If you are a dumb-hippie pagan, it's time to celebrate the Chakraladytree's bountiful harvest and grace or some such crap. That's not what I mean.