From: James Giles <JGiles@cris.com>
To: Andrew Gierth <andrewg@microlise.co.uk>
Subject: Re: language wars (results 13 September) last posting
Date: 1996/09/18
Date: 1996-09-18T00:00:00+00:00 [thread overview]
Message-ID: <32409DAA.785C@cris.com> (raw)
In-Reply-To: 51bv60$8d@pheidippides.axion.bt.co.uk
Andrew Gierth wrote:
> [...]
> However, 400 years is 4800 months, which is *not* divisible by 7.
> Therefore it is manifestly impossible for a specified day-of-the-month
> to fall equally on all days of the week. It so happens that the 13th
> falls most often on Friday.
The day of the week that the 13th of any month falls upon is entirely
dependent on the day of the week the first of that year falls upon and
on whether the year is a leap year or not. It does not depend on
whether the number of months is divisible by 12.
> [...]
> Skeptics are invited to write a program to do the calculation for
> themselves.
Assuming that *you* have done so, please have the courtesy to run it
2800 years and note that the 13th is equidistributed in weekdays.
Then you can come back and apologise. You have to run it more than
400 years because you have to go through a complete cycle of exceptions
to the century rule.
J. Giles
Ricercar Software
next prev parent reply other threads:[~1996-09-18 0:00 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-09-13 0:00 language wars (results 13 September) last posting Roy Gardiner
1996-09-13 0:00 ` William Clodius
1996-09-13 0:00 ` Peter Seebach
1996-09-21 0:00 ` Robert Dewar
1996-09-21 0:00 ` Robert Dewar
1996-09-16 0:00 ` Robert Fahey
1996-09-18 0:00 ` Norman H. Cohen
1996-09-18 0:00 ` James Giles
1996-09-18 0:00 ` James Giles [this message]
1996-09-18 0:00 ` Andrew Gierth
1996-09-18 0:00 ` Luke Chao
1996-09-19 0:00 ` Andrew Gierth
1996-09-19 0:00 ` Daniel J. Long
1996-09-21 0:00 ` Ken Pizzini
1996-09-24 0:00 ` Art Schwarz
1996-09-26 0:00 ` Ken Pizzini
1996-09-29 0:00 ` Paul Gilmartin
1996-09-26 0:00 ` Matthew D. Healy
1996-09-29 0:00 ` Randy MacDonald
1996-10-03 0:00 ` galina.kasminskaya
1996-10-03 0:00 ` Dave Tholen
1996-09-21 0:00 ` Ken Pizzini
1996-09-19 0:00 ` Norman H. Cohen
1996-09-20 0:00 ` John Girash
1996-09-20 0:00 ` John Girash
1996-09-20 0:00 ` Friday 13th, try it yourself (was Language Wars..) Clinton Pierce
1996-09-21 0:00 ` Russell Mosemann
1996-09-21 0:00 ` Russell Mosemann
1996-09-25 0:00 ` Barrie Walker
1996-09-26 0:00 ` Jim Shapiro
1996-09-25 0:00 ` Ken Pizzini
1996-09-25 0:00 ` Results of my test: Re: Friday 13th, try it yourself Lee Crites
1996-09-25 0:00 ` William Clodius
1996-09-27 0:00 ` Dik T. Winter
[not found] ` <52qpqt$1b3l@ilx018.iil.intel.com>
1996-10-02 0:00 ` Ken Pizzini
1996-10-02 0:00 ` Dik T. Winter
1996-09-26 0:00 ` Dr John Stockton
1996-09-26 0:00 ` Lee Crites
1996-09-26 0:00 ` Daan Sandee
1996-09-26 0:00 ` Jeff Drummond
1996-09-30 0:00 ` Ray Dunn
1996-09-26 0:00 ` John Winters
1996-09-26 0:00 ` Adam Beneschan
1996-09-27 0:00 ` Glen Clark
1996-09-27 0:00 ` CHI Research, Inc.
1996-09-27 0:00 ` Lee Crites
1996-09-28 0:00 ` John Winters
1996-09-30 0:00 ` Adam Beneschan
1996-10-01 0:00 ` Mike McCarty
1996-09-26 0:00 ` Dr John Stockton
[not found] ` <199609302101.JAA04610@kauri.vuw.ac.nz>
1996-09-30 0:00 ` Lee Crites
1996-09-23 0:00 ` Friday 13th, try it yourself (was Language Wars..) Matthew D. Healy
1996-09-23 0:00 ` Dik T. Winter
1996-09-25 0:00 ` Paul Gilmartin
1996-09-22 0:00 ` Dr John Stockton
1996-09-23 0:00 ` Randy MacDonald
1996-09-23 0:00 ` Dik T. Winter
1996-09-25 0:00 ` John Harper
1996-09-25 0:00 ` jupiter
1996-09-23 0:00 ` Dr John Stockton
1996-09-24 0:00 ` language wars (results 13 September) last posting Andrew Gierth
1996-09-24 0:00 ` Art Schwarz
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