Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site mordor.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!lll-crg!mordor!@S1-A.ARPA,@MIT-MC.ARPA:koolish@bbncd2 From: @S1-A.ARPA,@MIT-MC.ARPA:koolish@bbncd2 Newsgroups: net.space Subject: calendar Message-ID: <2872@mordor.UUCP> Date: Tue, 30-Jul-85 21:59:27 EDT Article-I.D.: mordor.2872 Posted: Tue Jul 30 21:59:27 1985 Date-Received: Thu, 1-Aug-85 20:45:38 EDT Sender: daemon@mordor.UUCP Organization: S-1 Project, LLNL Lines: 16 From: Dick Koolish Precession of the equinox has nothing to do with the Gregorian calendar. The Julian calendar was shifting with respect to the seasons because the year is not an integral number of days and the Julian calendar had it wrong. The Julian calendar had leap years every four years, which gave it 365.25 days per year. This is too many, since the year is 365.2422 days long. The Gregorian reform changed the calendar so that leap years were every four years except that century years were only leap years if they were divisible by 400. This gives a calendar year of 365.2425 days. By the time the Gregorian calendar was adopted, in 1582, the calendar was 10 days fast. When put into effect on October 4th, the next day became October 15th. The Gregorian calendar was adopted in England and the colonies in 1752 and not until 1918 by Russia. The Gregorian calendar still gives a year that is too long by 26 seconds so it will be one day off in 3200 years.