Triskaidekaphobia: Fear of the number 13

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Squarethecircle
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#21 Postby Squarethecircle » Fri Jun 13, 2008 11:29 am

I didn't even realize that.
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#22 Postby HURAKAN » Fri Jun 13, 2008 11:31 am

http://en.wikipedia.org/wiki/Mary-Kate_and_Ashley_Olsen

Happy Birthday to Mary Kate and Ashley Olsen, they were born in June, Friday the 13th, 1986. I don't see any bad luck around them. You can't be more successful!!!
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#23 Postby Cyclenall » Fri Jun 13, 2008 4:47 pm

More people are going to be weary of this date since there is all sorts of bad news this week and today. I don't believe it means a thing though.
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Re: Triskaidekaphobia: Fear of the number 13

#24 Postby dizzyfish » Fri Jun 13, 2008 5:01 pm

I totally forgot today was Friday the 13th. :lol:
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#25 Postby HURAKAN » Fri Jun 13, 2008 5:16 pm

I heard about it in the radio and that's how I realized that today was Friday the 13th. I have too many things in my mind to remember a superstitious date!!!

For the Hispanic culture the unlucky day is Tuesday the 13th.
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Re: Triskaidekaphobia: Fear of the number 13

#26 Postby HURAKAN » Fri Jun 13, 2008 5:28 pm

Friday the 13th
© Copyright 1999, Jim Loy

Friday the 13th is, of course, considered unlucky by some people. Personally, it is one of that many delightful holidays (including all Mondays) that I take off from work. I also joke that I can prove that no month has more than one Friday the 13th.

Examining a perpetual calendar (in the World Almanac) I see that we have a Friday the 13th whenever the month begins on a Sunday. I also see that every year has at least one and at most three Friday the 13ths (usually there are two). 1998 had three, 1999 had one, 2000 will have one. There can also be Friday the 13th in two consecutive months (February and March) as there were in 1998.

The probability that any randomly selected month will have a Friday the 13th would seem to be 1/7 (.1428571428...), as there are only seven types of month (ones that begin on Sunday, Monday, ...). And each would seem to be equally likely. It turns out that this is not quite true. It was shown by Brown (I don't know his first name) in 1933 that the Gregorian Calendar (which we use) repeats itself exactly, every 400 years. In that time, there are 4800 months and 4800 13ths. Of those 4800 13ths, 688 occur on Friday. So the probability of a Friday the 13th is 688/4800 which is .143333..., which is slightly greater than 1/7. In fact, Friday is the most likely 13th, slightly. Of the 4800 13ths, Sunday is the 13th 687 times, Mondya 685, Tuesday 685, Wednesday 687, Thursday 684, Friday 688, and Saturday 684.

A couple of years ago, I was about to report (on these WWW pages) that the probability of a Friday the 13th was 1/7. But I never got around to it.
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#27 Postby Cyclone1 » Fri Jun 13, 2008 7:12 pm

Oh please, I was born on Friday the 13th.

Really.

Friday, December 13, 1991.

:wink:
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#28 Postby HURAKAN » Fri Jun 13, 2008 7:13 pm

:uarrow: And you didn't turn out so bad, did you!!!!!!!!! :lol: :lol: :lol: :lol:
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#29 Postby JonathanBelles » Fri Jun 13, 2008 7:22 pm

HURAKAN wrote::uarrow: And you didn't turn out so bad, did you!!!!!!!!! :lol: :lol: :lol: :lol:


Thats debatable XD.
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Re: Triskaidekaphobia: Fear of the number 13

#30 Postby Squarethecircle » Fri Jun 13, 2008 9:25 pm

HURAKAN wrote:Friday the 13th
© Copyright 1999, Jim Loy

Friday the 13th is, of course, considered unlucky by some people. Personally, it is one of that many delightful holidays (including all Mondays) that I take off from work. I also joke that I can prove that no month has more than one Friday the 13th.

Examining a perpetual calendar (in the World Almanac) I see that we have a Friday the 13th whenever the month begins on a Sunday. I also see that every year has at least one and at most three Friday the 13ths (usually there are two). 1998 had three, 1999 had one, 2000 will have one. There can also be Friday the 13th in two consecutive months (February and March) as there were in 1998.

The probability that any randomly selected month will have a Friday the 13th would seem to be 1/7 (.1428571428...), as there are only seven types of month (ones that begin on Sunday, Monday, ...). And each would seem to be equally likely. It turns out that this is not quite true. It was shown by Brown (I don't know his first name) in 1933 that the Gregorian Calendar (which we use) repeats itself exactly, every 400 years. In that time, there are 4800 months and 4800 13ths. Of those 4800 13ths, 688 occur on Friday. So the probability of a Friday the 13th is 688/4800 which is .143333..., which is slightly greater than 1/7. In fact, Friday is the most likely 13th, slightly. Of the 4800 13ths, Sunday is the 13th 687 times, Mondya 685, Tuesday 685, Wednesday 687, Thursday 684, Friday 688, and Saturday 684.

A couple of years ago, I was about to report (on these WWW pages) that the probability of a Friday the 13th was 1/7. But I never got around to it.


I'd actually expect something like this, considering that the months are not aligned with the week. This is one of the reasons why math people consider all of those "in blah-blah-blah" days things just mindless busy work.
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Re: Triskaidekaphobia: Fear of the number 13

#31 Postby wbug1 » Sun Jun 15, 2008 1:46 pm

The fear of 13 thing could have something to do with Dante Alighieri's Divina Commedia, which took 13 years to write (1308-1321). Another is that, and related to the same theme as what was mentioned before, Judas Iscariot has 13 letters in it. In 1313, the Rosicrucian order was founded.
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Re: Triskaidekaphobia: Fear of the number 13

#32 Postby MississippiHurricane » Sun Jun 15, 2008 7:09 pm

Not this past friday the 13th but one last year........all hell broke loose for me. i was changing my oil and finished and my car would not start. the dealer didnt have the part so i went to a parts house..........10 times!!! They could not find the right part. On top of that i had to leave at 3 pm but instead left at 4 pm cause i could not get the right part for my car......then i finally got it in started it and both headlight bulbs blew.........fixed those......on the way home it was pouring down raining and hot so the windows steamed up inside like MAD so i had to roll the window down a bit to fix that but instead got soaking wet. So yea it sucked that day. This past Friday the 13th went a LOT smoother :)
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#33 Postby HURAKAN » Fri Feb 13, 2009 8:25 am

:grrr: :grrr: :grrr: HAPPY FRIDAY THE 13TH!!! :grrr: :grrr: :grrr:
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Re: Triskaidekaphobia: Fear of the number 13

#34 Postby HURAKAN » Fri Feb 13, 2009 8:39 am

Image

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#35 Postby Brent » Fri Feb 13, 2009 1:11 pm

HURAKAN wrote::grrr: :grrr: :grrr: HAPPY FRIDAY THE 13TH!!! :grrr: :grrr: :grrr:


and we get another one next month! :slime:
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Re: Triskaidekaphobia: Fear of the number 13

#36 Postby somethingfunny » Fri Feb 13, 2009 2:19 pm

I don't mind Friday the 13ths. It's Thursday the 12ths and Saturday the 14ths that usually live in infamy for me. Yesterday wasn't a bad day, so I'm worried what will happen tomorrow....
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#37 Postby HURAKAN » Fri Aug 13, 2010 7:50 am

Image

Happy Friday the 13!!
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#38 Postby HURAKAN » Fri Aug 13, 2010 7:58 am

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#39 Postby abajan » Fri Aug 13, 2010 7:49 pm

I for one think it’s a bunch of pure baloney!
My first realization of how seriously some people take this fear of 13 stuff was while touring Toronto, Canada back in 1980. All elevators in my aunt’s apartment building had . . . 11, 12, 12a, 14, 15 . . . not a 13 in sight!

I’ve never noticed Friday the 13th (or for that matter, Tuesday the 13th) to be any worse than any other day.
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Re: Triskaidekaphobia: Fear of the number 13

#40 Postby HURAKAN » Fri Aug 13, 2010 9:38 pm

Abajan, I don't believe about it either but I think it's funny that some people take so serious as to avoid it
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