Keld Jørn Simonsen <[EMAIL PROTECTED]> writes: > On Tue, Jul 05, 2005 at 09:18:23AM +0900, Olaf Meeuwissen wrote: >> Keld Jørn Simonsen <[EMAIL PROTECTED]> writes: >> >> >> FYI, the Hebrew calendar has 13 months in a "leap" year. The Baha'i >> calendar has 20 months. > > How is this controlled? I know one can figure out when easter is each > year, is it an algorithm like that? (I know, should google...)
There is a nice book called 'Calendrical Calculations' by Nachum Dershowitz and Edward M. Reingold (ISBN 0-521-564-74-3) that has lots of info on a large number of calendars. BTW, these are the people behind emacs' calendar mode. To get back to your question, a Hebrew year y is a "leap" year if (7y + 1) mod 19 < 7 > And Baha'i - is that calculable? By the looks of what in the book, yes. Hope this helps, -- Olaf Meeuwissen EPSON AVASYS Corporation, LAN FSF Associate Member #1962 sign up at http://member.fsf.org/ GnuPG key: 6BE37D90/AB6B 0D1F 99E7 1BF5 EB97 976A 16C7 F27D 6BE3 7D90 Penguin's lib! -- I hack, therefore I am -- LPIC-2
