The full moon closest to the autumnal equinox is called a “harvest moon.” In some years it happens in September and in other years it falls in October.
It’s called the Harvest Moon because, on days when it occurs, the time is short between sunset and moonrise. The light from the full moon helped farmers extend time available to harvest crops, even as the daylight hours grew shorter.
In 2013, the harvest moon is visible the nights of September 18 and 19. The moon will still be full-looking the night of September 20.
The autumnal equinox happens September 22.
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