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Skykept

When is the next full moon on Halloween?

A full moon on October 31 is rare — it happens only 9 times between 1900 and 2100 in US Eastern time. Here is every one, calculated from the Moon’s real orbit (US Eastern time):

Next full moon on Halloween (US Eastern): October 31, 2039

Halloween full moons, 1900–2100Exact time (US Eastern)
190611:46 PM GMT-5
192512:17 PM GMT-5
19449:35 AM GMT-4
19551:04 AM GMT-5
202010:49 AM EDT
20396:36 PM EDT
20588:54 AM EDT
20776:36 AM EDT
20967:16 AM EDT
Keep that night

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Questions

When was the last full moon on Halloween?

October 31, 2020 — it was also a blue moon (the second full moon that month).

Why does it depend on time zone?

The full moon is one instant; in some time zones it falls on October 31, in others on November 1 or October 30.

How rare is a Halloween full moon?

Very: in US Eastern time it happens only 9 times between 1900 and 2100. Sometimes the gap is 19 years (the Moon’s phases nearly repeat on the same dates every 19 years — the Metonic cycle), but between 1955 and 2020 there were none at all.

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