what is the 13th full moon in a year called?

Answer 1

Because the moon revolves around the Earth in a slightly different number of days than it takes the Moon to go through its full cycle from new moon to full moon and back again, sometimes we have more than one full moon in a calendar month.
We call this a "blue moon". This is were we get the saying that some things only happen "once in a blue moon."

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Answer 2

It could be called either the Cold Moon, Wolf Moon, or Blue Moon, depending on what naming convention you use.

Some almanacs use "Cold Moon" or "Moon before Yule" for the last full moon of winter, while others use that name for the December full moon whenever it happens. If the full moons falls after the solstice, some would call it the Wolf Moon instead, while others will apply that name to the January full moon.

As for the Blue Moon name, some almanacs use that designation for the second full moon in a month, so if there were two full moons in December, they would call that 13th moon Blue. But a Blue Moon any other time during the previous year would still give you that 13th moon in December.

Other almanacs use an older tradition for designating Blue Moons: the third full moon in a season that has four full moons. By this system, that 13th moon would have to be the first full moon of winter, and they'd call it the Wolf Moon or Moon after Yule.

Answer 3

I'm not aware that it has a special name. However, if you get two full moons in a single calander month, that is called a 'blue moon'. That means you get 13 full moons that year and incidentally happens about once every two years.

So the phrase 'once in a blue moon' actually means once every couple of years or so. Not as rare as you might think. [meaning most people use the phrase in error]

I don't know why they call it a blue moon. The moon certainly doesn't turn blue.

Answer 4

Calling the second full moon in a calendar month a "blue moon" is a relatively modern thing. The expression "Once in a blue moon" is much older. I understand (but I could be wrong) that the modern definition came from a popular almanac in which details of the second full moon for the month were printed in blue. The original comes from a real appearance of a blue moon which occurred after some volcanic eruptions. Krakatoa, for instance, produced a blue tinged moon in Europe. Blue moons were real but rare phenomena hence the expression "Once in a blue moon".

Answer 5

It's often called a "Blue Moon", though the currently accepted meaning of "Blue Moon" is simply the second full moon in any given month where one occurs.

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Answer 6

Since there are 13.4 real months in a year and our calender registers only 12 months in a year, this discrepancy shows one extra full moon (called blue moon)in the month of may this year in N hemisphere of the Globe.

Answer 7

Blue moon

Answer 8

It's just another full moon, unless you're superstitious.