Don't miss the full moon Sept. 17. The full moon closest to the autumnal equinox, it's gonna be a super Harvest Moon with a partial lunar eclipse.

Here's how you can watch Tuesday's full moon as take part in a rare synchronicity as a supermoon coinciding with an eclipse and a blood moon.

Here’s what to know about the celestial trifecta and how to watch it in the U.S. The harvest moon appears near the autumn equinox. Its name, according to the almanac, comes from the time when its brightness would help farmers harvest their end-of-season crops.