From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Christoph Herzog Newsgroups: gmane.emacs.devel Subject: Re: The Emacs Calculator and calendar Date: Wed, 10 Oct 2012 23:42:36 +0200 Message-ID: References: <87y5jk3f7d.fsf@gmail.com> <87626md8aj.fsf@Rainer.invalid> <83vcem6592.fsf@gnu.org> <5071E6E7.7080906@cs.ucla.edu> <50732AD7.8000003@cs.ucla.edu> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1349906423 4900 80.91.229.3 (10 Oct 2012 22:00:23 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 10 Oct 2012 22:00:23 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Oct 11 00:00:30 2012 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TM4KK-0008MK-4u for ged-emacs-devel@m.gmane.org; Thu, 11 Oct 2012 00:00:28 +0200 Original-Received: from localhost ([::1]:41935 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TM4KD-00020G-Td for ged-emacs-devel@m.gmane.org; Wed, 10 Oct 2012 18:00:21 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:43278) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TM4K7-0001zz-9d for emacs-devel@gnu.org; Wed, 10 Oct 2012 18:00:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TM4Jy-000357-T2 for emacs-devel@gnu.org; Wed, 10 Oct 2012 18:00:15 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:34176) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TM4Jy-0002xG-Lz for emacs-devel@gnu.org; Wed, 10 Oct 2012 18:00:06 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1TM4Jw-00089a-DA for emacs-devel@gnu.org; Thu, 11 Oct 2012 00:00:04 +0200 Original-Received: from p4ffe79f1.dip.t-dialin.net ([79.254.121.241]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 11 Oct 2012 00:00:04 +0200 Original-Received: from rhogez by p4ffe79f1.dip.t-dialin.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 11 Oct 2012 00:00:04 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 18 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: p4ffe79f1.dip.t-dialin.net User-Agent: Mozilla/5.0 (X11; Linux i686; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 In-Reply-To: X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:154277 Archived-At: On 10/09/2012 12:39 AM, Richard Stallman wrote: > Did the Ottoman empire use the Islamic calendar? They used two calenders at the same time. One Hijri (lunar Islamic calendar) and one Mali (fiscal, Julian calendar based but Hijri-years). There were so-called Sıvış years (leap years) that were omitted in the fiscal calendar (roughly every 30 years), until at some point they decided to let the years diverge so that by the beginning of the 20th century there was a difference of two years, e.g. 1324 Mali was 1908 as was 1326 Hijri. Basically, the important (and hard) thing is to have reliable calendar conversion. It makes sense to use the Gregorian calendar as a reference system, as a kind of yardstick (or tertium comparationis, if you like) to easier compare and relate dates given in different historical calendar systems even if, strictly speaking, it may be anachronistic.