Date: Tue, 3 Jan 2006 17:36:56 +1100 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Rich Wales <richw@richw.org> Cc: current@freebsd.org Subject: Re: FreeBSD handles leapsecond correctly Message-ID: <20060103063656.GF42228@cirb503493.alcatel.com.au> In-Reply-To: <20060103014508.948273C9ED@whodunit.richw.org> References: <20060102221948.EBE475D09@ptavv.es.net> <80965.1136240851@critter.freebsd.dk> <20060102232208.GC42228@cirb503493.alcatel.com.au> <20060103014508.948273C9ED@whodunit.richw.org>
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On Mon, 2006-Jan-02 17:45:08 -0800, Rich Wales wrote: >Peter Jeremy wrote: > >>Islam has its own calendar (with a particularly painful Leap Year >>calculation that gives very marginally more accuracy than the >>Gregorian). > >Are you perhaps thinking about the Iranian (Persian) calendar here? Having checked, it seems I mis-remembered (it was an article I read some years ago and I was certain that the author claimed that it was Islamic). Looking at the Iranian calendar, it matches the leap year configuration I recalled. >The Islamic calendar, AFAIK, is a 12-month lunar calendar which makes >=no= attempt whatsoever to stay in sync with the seasons. The Islamic calendar (at least the concensus from some googling) appears to have 11 leap years in a 30 (lunar) year cycle - and it seems that there isn't even general agreement on which years are leap years. >>I'm not sure how the Chinese, Hindu, Japanese and Jewish calendars >>handle leap years. > >The Jewish calendar uses a 13th lunar month un seven out of every 19 >years. Additionally, some months can have either 29 or 30 days, >depending on complex calculations. Compared to which, the Gregorian calendar appears quite sane :-). I'll stick by my assertion that the easiest solution is to move the earth and moon into orbits that have periods that are an integral number of days. -- Peter Jeremy
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