A rare full moon will shine for this year̵
Halloween night will include the lunar event of the year.
For the first time in decades, there will be a full moon visible across the United States on Halloween night, October 31.
The last time a full moon was seen in all American Halloween time zones was in 1944, according to the Farmers’ Almanac. The next time we see an equally ghostly full moon for Halloween is 2039, so plan your werewolf costumes accordingly.
The full moon on Halloween is also known as the “blue” moon because it is the second full moon of the month.
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The moon usually has only one full moon, but a second creeps in from time to time, NASA said. The full moon is divided into 29 days, while most months are 30 or 31 days long; so it is possible to fit two full moons in one month.
This happens on average every 2½ years.
Fun fact: Every full moon on Halloween is a blue moon, because the lunar cycles are 29.5 days long, and Halloween is always on October 31st.
(There is an alternative definition of a blue moon: When there are four full moons in a season, the third is considered a blue moon, the Farmer’s Almanac said.)
Of course, the moon will not look blue on Halloween night. It will be the same color as always.
Blue moons in photos are usually made using special blue camera filters or in a post-processing program like PhotoShop, according to Earthsky.org But there are rare cases where the moon acquires a bluish tinge, CNN reports.
Smoke or dust particles in the atmosphere, for example during a large volcanic eruption, can lead to a blue moon.
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In addition to being called the blue moon, the full moon of Halloween is also called the hunter’s moon. “Many moons ago, the Indians named this bright moon for obvious reasons,” the Farmers’ Almanac said. “The leaves are falling from the trees, the deer are getting fat, and it’s time to start storing meat for the long winter ahead.”
The first full moon of the month, October 1, was known as the Harvest Moon.
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