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In Mesoamerican divination, 13 is the number of important cycles of fortune/misfortune (see Trecena). 13 is the age that adepts usually start to learn Witchcraft.[dubious – discuss] Traditionally, there are 13 witches in a coven. In a Pentagram with a circle ratio of 13, each arm of the star will equal 12.36, the number of lunar months,days and hours in a solar year. Add the arms together and you get the number of full moons in 5 years. Many religions have 1 Messiah or Prophet and 12 followers for a total of 13.
On Friday 13 October 1307, King Philip IV of France ordered the arrest of the Knights Templar.
The moon moves 13 degrees around the earth every day. It Takes 13 days to change from Full Moon to New Moon and 13 days to change back with 1 day Full and 1 day New to equal 28 days of the Lunar Cycle
Using the Maine Farmers' Almanac definition of blue moon (meaning the third full moon in a season of four full moons, and where the seasons are marked by equal 3 month intervals between solstices and equinoxes as opposed to calendar quarters), blue moons have occurred or will occur on
2010 August 21,
2013 May 21,
2016 May 18,
2019 August 22,