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From: oster@lapis.berkeley.edu (David Phillip Oster)
Newsgroups: comp.bugs.4bsd
Subject: Re: bug in cal (1) - actually feature
Message-ID: <2265@jade.BERKELEY.EDU>
Date: Mon, 19-Jan-87 17:52:46 EST
Article-I.D.: jade.2265
Posted: Mon Jan 19 17:52:46 1987
Date-Received: Tue, 20-Jan-87 23:06:15 EST
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Reply-To: oster@lapis.berkeley.edu.UUCP (David Phillip Oster)
Organization: University of California, Berkeley
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Cal is documented to behave this way. Read your man page!  By the way,
it is an interesting question what cal should do if you ask for a year
before 1752. Different calendars were adopted in different places at
different times. I have a few references about the early calendar see:

Knuth, Art of Computer Programming, Vol 1., p .155
See CACM, 5 (1962) p. 209 - 210 for Easter < 1582
see also, Puzzles and Paradoxes, T. H. O'Beirne 
London:Oxford U. Press, 1965, Chap. 10

Anybody have any good references for early calendars?