Happy Autumnal Equinox! Congratulations on making it 1/4 of the way around the Sun (from my arbitrarily determined start point). This is, of course, our free annual trip that includes not one, but two stopovers at the celestial equator. Well, I should say it includes two points at which the Sun crosses the celestial equator, these points in time being known as the equinoxes.
Today’s equinox occurs at 0309 UTC (that’s tomorrow in England) otherwise known as 11:09 PM Eastern Daylight Time. So if you’re up at that time, or whatever time it happens to be in your particular time zone, stand an egg on its end and celebrate our orbital parameters.