From owner-freebsd-current@FreeBSD.ORG Tue Jan 3 06:37:02 2006 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 43E6016A41F for ; Tue, 3 Jan 2006 06:37:02 +0000 (GMT) (envelope-from PeterJeremy@optushome.com.au) Received: from mail17.syd.optusnet.com.au (mail17.syd.optusnet.com.au [211.29.132.198]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3EEBC43D45 for ; Tue, 3 Jan 2006 06:37:01 +0000 (GMT) (envelope-from PeterJeremy@optushome.com.au) Received: from cirb503493.alcatel.com.au (c220-239-19-236.belrs4.nsw.optusnet.com.au [220.239.19.236]) by mail17.syd.optusnet.com.au (8.12.11/8.12.11) with ESMTP id k036avPd025837 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Tue, 3 Jan 2006 17:36:58 +1100 Received: from cirb503493.alcatel.com.au (localhost.alcatel.com.au [127.0.0.1]) by cirb503493.alcatel.com.au (8.12.10/8.12.10) with ESMTP id k036avHh046716; Tue, 3 Jan 2006 17:36:57 +1100 (EST) (envelope-from pjeremy@cirb503493.alcatel.com.au) Received: (from pjeremy@localhost) by cirb503493.alcatel.com.au (8.12.10/8.12.9/Submit) id k036avZX046715; Tue, 3 Jan 2006 17:36:57 +1100 (EST) (envelope-from pjeremy) Date: Tue, 3 Jan 2006 17:36:56 +1100 From: Peter Jeremy To: Rich Wales Message-ID: <20060103063656.GF42228@cirb503493.alcatel.com.au> References: <20060102221948.EBE475D09@ptavv.es.net> <80965.1136240851@critter.freebsd.dk> <20060102232208.GC42228@cirb503493.alcatel.com.au> <20060103014508.948273C9ED@whodunit.richw.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060103014508.948273C9ED@whodunit.richw.org> User-Agent: Mutt/1.4.2.1i X-PGP-Key: http://members.optusnet.com.au/peterjeremy/pubkey.asc Cc: current@freebsd.org Subject: Re: FreeBSD handles leapsecond correctly X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Jan 2006 06:37:02 -0000 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