From: utzoo!decvax!harpo!ihnp4!ihldt!ihtnt!fjg
Newsgroups: net.misc
Title: 400 Year Cycle of Gregorian Calendar
Article-I.D.: ihtnt.246
Posted: Fri Jan 21 12:48:43 1983
Received: Sat Jan 22 04:58:38 1983

Due to the leap-year rule of the Gregorian calendar, the
sequence of years/leapyears repeates after 400 years.

Is it just a one in seven chance that a given date falls on the
same day of the week 400 years later ?

   October 1752		   October 2152
 S  M Tu  W Th  F  S	 S  M Tu  W Th  F  S
 1  2  3  4  5  6  7	 1  2  3  4  5  6  7
 8  9 10 11 12 13 14	 8  9 10 11 12 13 14
15 16 17 18 19 20 21	15 16 17 18 19 20 21
22 23 24 25 26 27 28	22 23 24 25 26 27 28
29 30 31		29 30 31

Joe Glynn BTL IH  ihtnt!fjg