2020 features first global Halloween Blue Moon since

A super moon is pictured at the beginning of a total lunar eclipse above Rafah in southern Gaza Strip, on September 28, 2015. (photo credit: ABED RAHIM KHATIB/FLASH90)

A super moon is pictured at the beginning of a total lunar eclipse above Rafah in southern Gaza Strip, on September 28, 2015.
(photo credit: ABED RAHIM KHATIB/FLASH90)

The events of 2020 have been strange enough that some might quip they would only happen once in a blue moon. But this year will even have one of those: At the end of October, an actual, rare blue moon will occur – on Halloween.
This year, October has two full moons. On the 1st or 2nd of October (depending on which time zone you are in) gave us the Harvest Moon, the full moon closest to the autumnal equinox, when day and night are of equal length. This normally occurs in September but edged into October this year. Also known as the Full Corn Moon or Barley Moon in some parts of America, farmers have traditionally made the most of its light to gather in crops well into the night before winter sets in.

This year the Harvest Moon was also the Hunter's Moon, again named for rural practices, this time of hunting summer-fattened animals under the light of the moon, which is brighter and lasts longer at this time of year. However, 2020's Harvest Moon is a micro full moon, since it is smaller than usual.
The second full moon in any given month is known as the Blue Moon; there are seven every 19 years. The name is something of a placeholder, given in order to keep the year's other full moons in their rightful place. This is because the moon completes 12 full cycles of its phase in 354 days, eleven short of the full solar calendar year of 365 days.
This year's is particularly unusual as it is the first full moon to occur across all time zones since 1944, although there is a full moon on Halloween somewhere in the world every 19 years – meaning that the next one to occur will be in 2039, followed by 2058 and 2077.
Some traditions count the third full moon in an astronomical season with four full moons as the Blue Moon. Either way, the extra moon is a way of reconciling solar and lunar calendars, much like the extra month of Adar II in the Jewish calendar, which also occurs seven times in a 19-year cycle.
In Jerusalem, the Harvest Moon occurred on October 2 at five minutes past midnight; the Blue Moon will occur on October 31 at 4:49 p.m. 

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