Tonight if you look toward the sky, you could see something that has not occurred in the last 20 years. Tonight you will be able to see a rare phenomenon called the super harvest moon.

A harvest moon is a full moon that occurs close to the fall equinox. It is the closest full moon to be seen to the first day of autumn. The latest date a harvest moon can occur is October 7.

Tonight is extremely rare, because the at 11:09 PM EST, is the beginning of the fall equinox. Tonight also happens to be a full moon. Not only will this be a harvest moon, but it will be a ‘super harvest moon’ because the full moon will actually fall on the exact date of the fall equinox this year.

The super harvest moon will be seen since the sun will be setting only 34 minutes after the moon rises. The moon is set to rise at around 6:43 PM EST, while the sun will be setting at 7:17.

According to NASA, “The two sources of light will mix together to create a kind of 360-degree, summer-autumn twilight glow,”

Normally the moon rises approximately 50 minutes after the sun sets, but during the harvest moon, the timing is only 30 minutes apart. This allows for a colorful sunset and sometimes larger moon, that is like no other you will see all year.

So if you are out and about tonight and have a chance to look outside, you should look to the moon to see the first super harvest moon in 20 years. If you miss it, you won’t see another until 2029.