Every year, at the end of the summer, we get to witness a very special full moon.
It's called the Harvest Moon.
It's named that way because it appears closer to the autumn equinox than the full moon in October.
But this year's moon, won't just be a Harvest Moon it will also be a Supermoon!
And it's happening tonight! (September 16)
This will be the time of year when the moon is almost at it's closet distance from earth.
Combine that with a phenomenon called "Moon Illusion" and the it will appear gigantic!
Moon Illusion occurs when the moon appears lower on the horizon.
Your brain struggles to make sense of the size and distance between the objects your eyes are seeing. The opposite effect happens when the moon is high up in the sky. Since there are no objects nearby, it appears smaller.
This Supermoon is also supposed to change colors. That's because on the other side of the planet, there will be a "penumbral lunar eclipse". This means that from our side of the planet the moon may have a slight crimson hue.
This will be the last time until 2029 that you'll be able to see the Harvest Moon coinciding with the autumn equinox.