Today is December 13, 2024, and it’s a Friday. And it’s the second of two Friday the 13ths in 2024.Any calendar year has at least one – but no more than three – Friday the 13ths.There’s a name for having an irrational fear of Friday the 13th: friggatriskaidekaphobia.Folklorists state that there’s no written evidence that Friday the 13th was considered unlucky before the 19th century.Even in the Middle Ages, people would not marry – or set out on a journey – on a Friday.In modern times, the slasher-movie franchise Friday the 13th has helped keep friggatriskaidekaphobia alive.Because the Gregorian calendar has a 400-year cycle, September-December Friday the 13th years recur in cycles of 400 years.If you’re up for doing the computations, you’ll find September-December Friday the 13th years repeat at different intervals in other centuries too.Bottom line: Scared of Friday the 13th? It’s just a feature of our Gregorian calendar, and a pretty common one at that.The Gregorian calendar features 688 Friday the 13ths.