The full moon of September 2021 will be shining in the night sky this week, just in time for the official start of fall as the autumn equinox arrives.
Full Moon in Pisces
Better known as the “harvest moon,” the September moon will officially reach its fullest phase at 7:54 p.m. on Monday, Sept. 20. But it will look big and bright for a few days.

The moon will be 98% full on Sunday, 100% full Monday and Tuesday, and 98% full on Wednesday, Sept. 22 — the first official day of fall, known as the autumn equinox or autumnal equinox.

The full moon of September, known as the harvest moon, will be biggest and brightest on Monday, Sept. 20, 2021. It also will be 100% full on Tuesday, Sept. 21.

When to see the full moon rise

The best time to see the September harvest moon will be when it begins to rise in the eastern sky at about 7:15 p.m. Eastern time Monday, 20 minutes after the sun sets, and as it starts to rise at 7:36 p.m. on Tuesday.

The near-full moon will be rising Sunday at 6:48 p.m. and Wednesday at 7:59 p.m.

Nicknames for the September full moon

September’s full moon has a nickname related to the growing season. During most years, it is called the “harvest moon,” but sometimes that nickname is reserved for the October full moon.

It all depends on which of those two full moons appears closest to date of the autumn equinox.

Because this year’s full moon will appear on the night of Sept. 20, two days before autumn arrives, it will be called a harvest moon.

Last year, the September full moon appeared on Sept. 1, followed by another full moon on Oct. 1. “Because October 1 was closer to the equinox, October’s full moon was called the harvest moon and September’s full moon took on its traditional name: the corn moon,” the Old Farmer’s Almanac noted.

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