fjg (01/21/83)
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
ken (01/25/83)
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.