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Celebrate The End Of Summer With Monday's Harvest Moon

Last year's harvest moon took place on Oct. 1. The lunar event is designated as the full moon occurring nearest to the autumnal equinox every year.
Anadolu Agency via Getty Images
Last year's harvest moon took place on Oct. 1. The lunar event is designated as the full moon occurring nearest to the autumnal equinox every year.

For those in the Northern Hemisphere, summer will come to an end next Wednesday. Slowly but surely since the middle of June, days have been getting shorter. With the arrival of the autumn equinox comes cooler weather and a change of color amongst the trees. And Monday, two days before the official start of fall, the harvest moon.

For three days, moonrise will come shortly after sunset, but the harvest moon will reach its peak illumination at 7:54 p.m. ET Monday. Historically this lunar event provided farmers a little extra light to harvest their crops. However, unlike the equinoxes, which take place at the same time each year, the harvest moon is the full moon closest to the autumnal equinox. Which means it can fall in September or October, according to The Old Farmer's Almanac.

Sometimes the harvest moon might appear to be slightly bigger, such as in 2015, when it was also the year's closest and biggest supermoon. The moon's orbit around the Earth isn't a perfect circle, NASA explains. During supermoon events, the moon is closer to Earth, known as the perigee. At its closest point the moon is about 226,000 miles from Earth. But sometimes the harvest moon occurs when the moon is furthest from Earth in orbit, the apogee, at 253,000 miles away. To the naked eye, however, these size differences are barely distinguishable, according to NASA.

If spectators catch the moon rising at just the right time, it will appear orange in color. But this theatrical touch isn't specific to the harvest moon. The moon varies in color depending on a handful of factors, including where the viewer is standing. When Earth's satellite is closest to the horizon it takes on a red or yellow color, NASA says. But as it continues to rise it will gradually take on its traditional pale, white color.

East Asian culture celebrates the August Moon Festival, which doesn't always coincide with the rising of the harvest moon itself. According to the Boston Public Library, the festival can be traced back to 771 B.C. and was celebrated by harvesting rice and wheat on the night of the full moon. Similar to Thanksgiving in the United States, the August moon is celebrated by the gathering of friends and families, but instead of turkey, people eat mooncakes, a sweet and savory dessert.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

Corrected: September 28, 2021 at 12:00 AM EDT
An earlier version of this story incorrectly suggested that a supermoon appears larger to the naked eye. In fact, the differences are barely distinguishable to the naked eye.
Dustin Jones
Dustin Jones is a reporter for NPR's digital news desk. He mainly covers breaking news, but enjoys working on long-form narrative pieces.