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.