Many Australians out trick-or-treating for Halloween will be able to catch a glimpse of a super rare blue moon on Saturday night.
Even though the Full Blue Moon is supposed to fall on the same day every 19 years, the lunar cycle shifted after 1944, so that it fell on November 1 instead of October 31.
The second of the two full moons is particularly significant, not just because it's a "blue moon" (the second in a single calendar month) but also because it falls on Halloween, a mid-fall holiday which is also celebrated as Samhain, an ancient Gaelic tradition that is still practiced by modern pagans.
Usually there are 12 full moons in a year but every so often there will be 13, meaning that in one month there will be two full moons. The first one was on January 31 and the second Blue Moon followed on March 31.
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It was only in the eighth century that Pope Gregory III designated November 1 as All Saints Day, and the evening before - October 31 - was dubbed All Hallows Eve.
"It gets even better in that Saturday is also the date that the distant dim planet Uranus is at opposition to the sun.so Uranus is closest to the Moon that night also". "Yes, that means February is S.O.L.in its bid for Blue Moons".
Arora added being outdoors and enjoying a unique event such as a blue moon, is a great pandemic-friendly activity. The second moon was associated with a hunter because "The leaves are falling from trees, the deer are fattened, and it 's time to begin storing up meat for the long winter ahead".
Despite its name, the moon will not look blue, but its usual white glow. Interested individuals can spot the moon as usual tomorrow, but will have to wait until 2039 to host another month having two full moons. "They make stargazing harder, but the full moon is so lovely in its own right that it deserves a bit of celebration every 28 days".
A full moon rises above the Sydney Opera House (pictured).