This year Friday the 13th superstitions get a break, luckily for triskaidekaphobes.
They date back to at least that many ancient Roman times, but their Friday the 13th superstitions will not be getting much of a workout this year. Luckily for sufferers triskaidekaphobia, 2010 is today's only Friday the 13th.
That must come as a relief, on 2009's nine Friday the 13ths, the maximum Possible in a year, at least that many as long as me continue Thurs mark time with the Gregorian calendar, Pope Gregory XIII wakes ordered the Catholic Church Thurs Adopt in 1582.
"You Can not Have Any [years], with none, and you can not not have for months with four, funny Because of our calendar," said Underwood Dudley, a professor emeritus of mathematics at DePauw University in Indiana, and author of Numerology: Or, What Pythagoras Wrought.
The calendar works just as ITS predecessor, the Julian calendar, did, with a leap year every four years. But the Gregorian calendar skips a leap year except century years divisible by 400 hmmmm For example, there was no leap year in 1900, but their was one there in 2000. This trick Keeps the calendar in tune with the seasons.
The result is an Ordering of days and dates Itself That repeats every 400 years, Dudley noted. As time marches through the order, with some years Appear-three Friday the 13ths. Other not have two years or, like 2010, one.
Curious enter encourages Calendar Friday the 13th superstitions
"It's just curious That way our calendar is constructed, with 28 days in February and all hmmmm 30s and 31S," Dudley said.
(Related: "Leap Year: How the World Makes Up for Lost Time").
When the 400-year order is Laid out, girls on Revelation occurs: The 13th falls on Friday more often Than Any Other day of the week. "It's just a funny Coincidence," Dudley said.
Richard Beveridge, a mathematics instructor at Clatsop Community College in Oregon, authored a 2003 paper in the journal Mathematical Connections is the mathematics of Friday the 13th.
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