This month’s full moon is known as a Harvest Moon and just happens be on Friday the 13th to make for an even eerier night. The harvest moon is the full moon that occurs closest to the autumnal equinox each year. This year's equinox, which marks the first day of autumn, falls on September 23.
Harvest Moon got its name from farmers who welcomed the extra light to work later into the evening at harvest time.
This year’s Harvest Moon is also a “micro-moon” because it will at its farthest from Earth, making it appear about 14 percent smaller in the sky, according the Farmer’s Almanac. This is because the moon is also nearing its apogee, the point in its nearly month-long elliptical orbit at which it's furthest away from Earth.
The last time there was a Harvest Moon on Friday the 13th happened on Oct. 13, 2000 and it is not expected to occur again until August 13, 2049.
The full harvest moon will rise just after sunset but the best time for viewing is when it reaches its peak at 12:30 a.m. on Saturday.
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