According to the old farmer Almanac, the term blue moon used to be referred to when full moons occurred within a given season instead of the typical three.
The astronomer James Hugh interpreted the term wrote in the famous sky. Telescope magazine that a Blue moon is the second full moon in a calendar month with two full moons.
A Blue Moon is not blue in color however, in 1883 people in Indonesia witnessed Blue Moon for almost two full years.
Full moons were all blue or green but later revealed by the scientists it was due to the volcanic ash erupted due to the explosion in mount Krakatoa.
The blast was equivalent to a megaton nuclear bomb explosion. Huge clouds were filled in the sky with particles about 1 micron wide and scattered red light while allowing other colors to pass. This caused moonbeams to emerge as blue.
There are two types of Blue Moon- Seasonal Blue Moon and Monthly Blue moon. Seasonal Blue Moon is the third Full moon of an astronomical season that has four full moons-. This year’s Sturgeon Moon.
This will be perfectly full at 8:01 a.m. Eastern Daylight Time (12:01 Universal Time), following the Moon’s sunset on the US East Coast.
\This implies that Americans will witness nearly full Moons on two consecutive nights – August 21-22 and August 22-23. With the Moon closest to full before dawn on the 21st and again after twilight on the 22nd. It occurs on the 22nd of August due to June’s full moon falls just a few days after the June solstice. It can be seen at the interval of about 2.7 years according to the American Astronomical Society. So Skywatchers be ready to watch such a rare seasonal moon.
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