PORTLAND, Ore. (KOIN) – Another beautiful full moon will be in the night sky come this Friday, Sept. 13.
This time it’s the Harvest Moon, which is the full moon that is closest to the first day of Autumn. It doesn’t always occur before the Autumnal Equinox (Sept. 23rd, 2019), but this year it will.
The Farmers’ Almanac says the last time this happened was Oct. 13, 2000. The next won’t happen again until Aug. 13, 2049. The occurrence of a full moon on a Friday the 13th happens on average every 20 years, according to the Almanac.
If you want to check this moon out, the sun will set in the west horizon at 7:25 p.m. and you will be able to start spotting the full moon low in the eastern horizon after 7:44 p.m. Friday evening.
This moon will usually take on a red or orange appearance because of the light that scatters; this effect is called Rayleigh scattering.
According to Jim Todd of OMSI, the moon seen near the horizon will appear bigger than usual in size because of an illusion called “the moon illusion,” where an object appears to be nearer and tricks your brain a bit.
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