From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Ed Reingold Newsgroups: gmane.emacs.bugs,gmane.comp.time.tz Subject: Re: cal-persia.el disagrees with Iranian calendar in A.D. 2025 Date: Thu, 31 Mar 2005 08:39:38 -0600 Message-ID: <200503311439.j2VEdcFG015069@emr.cs.iit.edu> References: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7BIT X-Trace: sea.gmane.org 1112280502 7760 80.91.229.2 (31 Mar 2005 14:48:22 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Thu, 31 Mar 2005 14:48:22 +0000 (UTC) Cc: bug-gnu-emacs@gnu.org, Oscar van Vlijmen , tz@elsie.nci.nih.gov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Mar 31 16:48:17 2005 Return-path: Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1DH0wF-0000Y8-Gp for geb-bug-gnu-emacs@m.gmane.org; Thu, 31 Mar 2005 16:46:27 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1DH1Cx-0001YS-9H for geb-bug-gnu-emacs@m.gmane.org; Thu, 31 Mar 2005 10:03:43 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1DH1Ce-0001Pi-3n for bug-gnu-emacs@gnu.org; Thu, 31 Mar 2005 10:03:25 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1DH1CX-0001Ls-By for bug-gnu-emacs@gnu.org; Thu, 31 Mar 2005 10:03:18 -0500 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1DH1CX-0001LK-5q for bug-gnu-emacs@gnu.org; Thu, 31 Mar 2005 10:03:17 -0500 Original-Received: from [216.47.143.101] (helo=email2.iit.edu) by monty-python.gnu.org with esmtp (Exim 4.34) id 1DH0tj-0002gO-45 for bug-gnu-emacs@gnu.org; Thu, 31 Mar 2005 09:43:51 -0500 Original-Received: from emr.cs.iit.edu (emr.cs.iit.edu [216.47.142.126]) by email2.iit.edu (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0IE8002WY0U5U0@email2.iit.edu> for bug-gnu-emacs@gnu.org; Thu, 31 Mar 2005 08:42:05 -0600 (CST) Original-Received: from emr.cs.iit.edu (localhost [127.0.0.1]) by emr.cs.iit.edu (8.12.10+Sun/8.12.9) with ESMTP id j2VEdcFG015069; Thu, 31 Mar 2005 08:39:39 -0600 (CST) In-reply-to: Message from Paul Eggert "of Thu, 31 Mar 2005 02:18:23 EST." <87u0msz3k0.fsf@penguin.cs.ucla.edu> Original-To: Paul Eggert X-Mailer: exmh version 2.7.0 06/18/2004 with nmh-1.0.4 X-BeenThere: bug-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:11020 gmane.comp.time.tz:391 X-Report-Spam: http://spam.gmane.org/gmane.emacs.bugs:11020 > It mentions the March 20, 2025 discrepancy, and it has some > interesting and not-altogether-positive things to say about the method > used in GNU Emacs. I hadn't realized how controversial this area is. Had I realized how controversial it was, I would not have included it in Emacs, I only learned that is 1998, long after the code was released. Still, it is not a bad approximation, but it should be labeled as such. > Thanks for clarifying this. Would it be appropriate to make the > following change to the GNU Emacs user documentation, if only to help > forestall future bug reports in this area? Your change (below) is fine. > > 2005-03-31 Paul Eggert > > * calendar.texi (Calendar Systems): Mention that the Persian > calendar implemented is the arithmetical calendar of Birashk. > > --- calendar.texi.~1.33.~ 2005-03-28 16:30:06 -0500 > +++ calendar.texi 2005-03-31 01:46:45 -0500 > @@ -691,6 +691,12 @@ Their calendar consists of twelve months > days, the next five have 30 days, and the last has 29 in ordinary years > and 30 in leap years. Leap years occur in a complicated pattern every > four or five years. > +The calendar implemented here is the arithmetical Persian calendar > +championed by Birashk, based on a 2,820-year cycle. It differs from > +the astronomical Persian calendar, which is based on astronomical > +events. As of this writing the first future discrepancy is projected > +to occur on March 20, 2025. It is currently not clear what the > +official calendar of Iran will be that far into the future. > > @cindex Chinese calendar > The Chinese calendar is a complicated system of lunar months arranged