稀有的万圣节蓝色月亮让天空观察者兴奋不已

稀有的万圣节蓝色月亮让天空观察者兴奋不已

A rare Halloween 蓝月亮 has been thrilling skywatchers across the globe.

The last time a blue 月亮 occurred on Halloween was in 2001, 根据 Farmer’s Almanac, and will not happen again until 2039.

As the second full moon of the month, it is classified as a blue moon. “In recent years, people have been using the name Blue moon for the second of two full moons in a single calendar month,” explains NASA, on its 网站. “An older definition of Blue moon is that it’s the third of four full moons in a single season.”

BLUE MOON TO APPEAR ON HALLOWEEN FOR THE FIRST TIME IN NEARLY 20 年份

The month’s other full moon, “harvest moon,” occurred on Oct. 1. Old Farmer’s Almanac notes that the harvest moon is the full moon closest to the beginning of fall or the autumnal equinox.

A rare Halloween blue moon moon rises over a bank of lights at Falcon Stadium in the second half of an NCAA college football game between Air Force and Boise State, 星期六, 十月. 31, 2020, at Air Force Academy, 科洛.

A rare Halloween blue moon moon rises over a bank of lights at Falcon Stadium in the second half of an NCAA college football game between Air Force and Boise State, 星期六, 十月. 31, 2020, at Air Force Academy, 科洛. (美联社照片/ David Zalubowski)

Skygazers, 然而, should not expect the Halloween blue moon to be, well … blue. “Most Blue Moons look pale gray and white, indistinguishable from any other Moon you’ve ever seen,” explains NASA.

The term “blue moon” evolved to denote something that is absurd, 根据 Space.com, citing Philip Hiscock, a folklorist at the Memorial University of Newfoundland, 在一个 2012 article in Sky & Telescope 杂志.

The full moon rises over the outskirts of Frankfurt, 德国, 星期六, 十月. 31, 2020. The full moon is known as a Blue Moon. (AP Photo/Michael Probst)

The full moon rises over the outskirts of Frankfurt, 德国, 星期六, 十月. 31, 2020. The full moon is known as a Blue Moon. (AP Photo/Michael Probst)

In rare circumstances, 然而, the moon can look blue. “A truly-blue Moon usually requires a volcanic eruption,” explains NASA. “Back in 1883, 例如, people saw blue moons almost every night after the Indonesian volcano Krakatoa exploded with the force of a 100-megaton nuclear bomb. Plumes of ash rose to the very top of Earth’s atmosphere, and the Moon … it turned blue!”

Fox News’ Chris Ciaccia contributed to this article.

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