A rare full moon will be visible in the night sky across the United States on Friday the 13th.
For example, the moon rises closer to the time of sunset, according to EarthSky, which means the moon rises during or near twilight, appearing as if there are several moons for the peak nights.
The moon will be at its full size on the East Coast at 12:33 a.m. Saturday, the 14th.
Maine Farmers' Almanac astronomer Joe Rao said: "The arrival of this year's Harvest Moon will depend on which time zone you happen to live in".
It won't happen again until August 13th, 2049.
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In astronomical terms, the moon is considered "full" when the Earth is positioned between the sun and our natural satellite. "Thus, from night to night the Moon moves more horizontally than vertically and thus rises sooner from one night to the next". This is because the moon is also nearing its apogee-the point in its almost month-long elliptical orbit at which it s furthest away from Earth.
This harvest moon is also being called a "Micro Moon" because it looks smaller than usual, which will make this Harvest Moon slightly less bright than average, according to Forbes.
In this file photo, the Reid family harvest their wheat crop under a harvest moon near Cremona, Alta., Monday, Sept. 28, 2015.
Unless cloud cover blocks the view, the full moon is the easiest celestial event to observe.