Only Friday the 13th that fall in October count!
Period. Full stop.
Full moon has nothing to do with it.
The superstition has to do with the dissolution of the Knights Templar.
And that happened on Friday, October 13, 1307.
This is December, NOT October, so Friday the 13th does NOT COUNT.
Repeat, does NOT count.
On average we get a Friday the 13th every 212 days.
The LAST Friday the 13th in October was in 2017.
The next Friday the 13th in October will be in 2023.
The ’13’ really has nothing to do with the supposed thirteen attendees at the ‘Last Supper’ — particularly since there is no consensus, at all (at all), that the ‘Last Supper’ took place on a Friday — that traditionally been the date of the Crucifixion, hence ‘Good Friday‘ at Easter.
The superstition about Fridays the 13th being unlucky really has its roots in Friday, October 13, 1307, when, with the blessing of the French Pope, Clement V, the French King, Philip IV, who was heavily in fiscal debt to the Templar’s (the original international bankers), had most of the Templars in France arrested.
It was a bad day for the Templars — and was really the first major financial crisis in world history.
Hence why people were afraid of Fridays the 13th. They didn’t want a repeat of what happened to the (far from) ‘poor’ Templars.
This fact tends to be forgotten.
Friday the 13th in October happens per a 5 to 6 year cycle with occasional 11-year gaps.
We just had one of those. So, the last 13th in October was 11-years ago, 2006. The next one is 6-years from now.
At 66 I have only lived through 9 ‘Friday the 13th in October‘.