From: utzoo!decvax!decwrl!turtleva!ken
Newsgroups: net.misc
Title: Re: 400 Year Cycle of Gregorian Calendar
Article-I.D.: turtleva.132
Posted: Mon Jan 24 20:34:20 1983
Received: Thu Jan 27 19:37:52 1983
References: ihtnt.246

If what you say is true, there is a 1-in-1 chance that a given date
will fall on the same day of the week 400 years later.  It would
probably be a 1-in-7 chance that a given date will fall on the same day
of the week in any other year, but the calandar is so uneven I suspect
that the correlation function shows subcycles where both a better and
worse than 1-in-7 chance occurs.