Friday 13th full moon: What is a Harvest moon and when was the last one?

MOON watchers are in for a treat tonight on Friday the 13th.
The Harvest Moon will appear tonight in a rare occurrence.
What is happening tonight?
SEPTEMBER 2019: Harvest Moon
This full moon, which falls closest to the September equinox, is named after the Harvest season.
It will shine its brightest at 5.33am on September 14.
The month of the Harvest Moon varies with it appearing in October every three years.
When it appears in October the September Moon is known as Full Corn Moon.
Which full moons have we already seen this year?
JANUARY 2019: Wolf Moon
Sometimes known as Old Moon, this spectacle shined brightest at 6.16amam on January 21.
Wolves were often heard howling with hunger in America around this time of year - which is how the moon got its name.
FEBRUARY 2019: Snow Moon/Blue Moon
The moon, which peaked at 4.53pm on February 19, is named after America's snowy season.
Because it's the second spectacle in a month, it can also be known as the Blue Moon.
While some call it the Hunger Moon, because of the difficult hunting conditions at this time.
MARCH 2019: Worm Moon
This particular spectacle has many names - and can also be known as the Sap Moon, Crow Moon or Lenten Moon.
In 2019, it fell on March 21 - and shone its brightest at 1.42am.
APRIL 2019: Pink Moon
Despite its name, don't be expecting a pink moon. This spectacle is named after the wildflowers which grow in the United States and Canada in the spring.
It's also known as the Egg Moon or Fish Moon, because of the shad fish that swim upstream at this time of year.
This moon is particularly important because it is used to fix the date of Easter, which falls on the first Sunday after the Pink Moon, and marks the start of the Jewish Passover.
In 2019, the pink moon rose on April 19 at 12.12pm.
MAY 2019: Flower Moon
This moon signifies the blooming of flowers and the variety of flowers that bare their petals in May - it is also known as Corn Planting Moon and Milk Moon.
In 2019, this full moon was on May 18. It peaked at 10.11pm.
JUNE 2019: Strawberry Moon
This moon marks the beginning on the strawberry picking season - and is also known as the Rose Moon, Hot Moon or Hay Moon.
In 2019 you could catch a glimpse of this full moon on June 17.
It shone its brightest here in Britain at 9.30am.
JULY 2019: Buck Moon
The Full Moon in July is the Buck Moon, named after the new antlers that emerge from buck's foreheads around this time of the year.
It is also called Thunder Moon, Hay Moon, and Wort Moon.
You can catch it at 10.38pm on July 16.
AUGUST 2019: Sturgeon Moon
Native Americans named this moon after the large number of sturgeon fish in the lakes at this time.
It's also known as the Green Corn Moon, Barley Moon, Fruit Moon or Grain Moon - and you can catch it at 1.29pm on August 15.
When is the next full moon in 2019?
OCTOBER 2019: Hunter's Moon
As people planned ahead to winter, October traditionally became a big time for hunting game - which were becoming fatter thanks to falling grains.
It's also known as the Travel Moon or, rather depressingly, the Dying Grass Moon.
You'll catch the best glimpse at 10.08pm on October 28.
Every three years the October Moon is the Harvest Moon.
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NOVEMBER 2019: Beaver Moon
This moon is named after the beavers who build their winter dams at this time of year.
It's also known as the Frost Moon, for obvious reasons, and peaks at 1.34pm on November 12.
Traditionally, the last full moon before the winter solstice has also been named the Mourning Moon.
DECEMBER 2019: Cold Moon
There's no prizes for guessing how this wintery moon got its name.
This year, it will shine its brightest here in Britain at 5.12am on December 12.