The Halloween night sky is a blue moon, lit by the second full moon in a month. According to NASA’s National Space Science Data Center, a relatively rare event occurs on average every two and a half years.
Each month has a full moon, but since the lunar cycle and the calendar year are not fully synchronized, we rotate twice every three months in the same calendar month.
The first full moon in October, also known as the harvest moon, appears on the first day of the month. The second full moon, or blue moon, is visible on October 31. This is the first event of a blue moon in the United States since March 2018.
According to the Farmers’ Almanac, this is the first time since 1944 that a Halloween moon has appeared in all time zones. The last Halloween moon appeared in the Central and Pacific Observatory in 2001.
The “once blue moon” event does not mean that the moon will be blue on Halloween. The dark blue tone of an evening sky can affect the color we see, and the Earth’s satellite often does not appear blue.
Typically, when a moon takes on a blue color, it is caused by smoke or dust particles in the atmosphere, such as during a large volcanic eruption.
When the phrase “once in the blue moon” was coined, it was, according to NASA, you would be lucky (or unfortunately) 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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