It's the winter solstice! Well, technically the winter solstice occurred a few hours ago, at 05:30 GMT (that's 12:30 a.m. EST), but you get the idea. The point is, the winter solstice just happened, and that means a few things for those of us living in the Northern Hemisphere.
The September equinox occurred this morning at 5:05 am EDT, marking the official start of Fall for those of us in the Northern Hemisphere. Twice a year, during the latter halves of March and September, every person on Earth experiences the effects of an equinox in the form of a 12-hour day followed by a 12-hour night.
Thanks to a lunar eclipse on the longest night of the year, tonight we'll be experiencing the longest, darkest night in a very long time. It's been nearly 500 years since the last solstice lunar eclipse. Here's what you'll see.