The night sky on Halloween is lit by a blue moon, the second full moon of the month. According to NASA’s National Space Science Data Center, relatively rare events occur on average every two and a half years.
Every month has a full moon, but since the lunar cycle and the calendar year are not fully synchronized, there are two in the same calendar month every three years.
The first full moon of October, also known as the harvest moon, appears on the first day of the month. The second full moon or blue moon will appear on October 31. This is the first event of a blue moon in the United States since March 2018.
A Halloween full moon appears for the first time since 1944, according to Farmers’ Almanac. The last Halloween full moon to appear in the Central and Pacific Orient was in 2001.
The phenomenon of “once on the blue moon” does not mean that the moon will appear blue on Halloween. Although the dark blue tone of an evening sky affects the color we see, the Earth’s moon is almost never blue.
Usually, when a moon turns blue, it is due to smoke or dust particles in the atmosphere, such as a large volcanic eruption.
According to NASA, when you use the phrase “once on a blue moon”, you are lucky (or unlucky) to see it in your lifetime.
So if something unusual happens to you on Halloween, there may be a good reason for it.
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