From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Drew Adams" Newsgroups: gmane.emacs.help Subject: RE: How does Emacs calculate Easter Sunday? Date: Thu, 5 Jul 2012 13:15:20 -0700 Message-ID: <43212A3051534567848BB6A589CE9499@us.oracle.com> References: <1341514935.12422.YahooMailNeo@web163104.mail.bf1.yahoo.com> <3FE9DB99-982F-4442-9AFF-142650895368@Web.DE> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1341519339 8552 80.91.229.3 (5 Jul 2012 20:15:39 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 5 Jul 2012 20:15:39 +0000 (UTC) Cc: help-gnu-emacs@gnu.org To: "'Peter Dyballa'" , "'Enda'" Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Jul 05 22:15:37 2012 Return-path: Envelope-to: geh-help-gnu-emacs@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 1SmsSd-0000pn-ON for geh-help-gnu-emacs@m.gmane.org; Thu, 05 Jul 2012 22:15:35 +0200 Original-Received: from localhost ([::1]:52808 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SmsSc-0007yo-Ms for geh-help-gnu-emacs@m.gmane.org; Thu, 05 Jul 2012 16:15:34 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:42042) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SmsSW-0007yY-RW for help-gnu-emacs@gnu.org; Thu, 05 Jul 2012 16:15:30 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SmsSV-000698-1Z for help-gnu-emacs@gnu.org; Thu, 05 Jul 2012 16:15:28 -0400 Original-Received: from acsinet15.oracle.com ([141.146.126.227]:51220) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SmsSU-00068E-SF for help-gnu-emacs@gnu.org; Thu, 05 Jul 2012 16:15:26 -0400 Original-Received: from acsinet21.oracle.com (acsinet21.oracle.com [141.146.126.237]) by acsinet15.oracle.com (Sentrion-MTA-4.2.2/Sentrion-MTA-4.2.2) with ESMTP id q65KFMOg018655 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 5 Jul 2012 20:15:23 GMT Original-Received: from acsmt358.oracle.com (acsmt358.oracle.com [141.146.40.158]) by acsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id q65KFMUF029888 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 5 Jul 2012 20:15:22 GMT Original-Received: from abhmt114.oracle.com (abhmt114.oracle.com [141.146.116.66]) by acsmt358.oracle.com (8.12.11.20060308/8.12.11) with ESMTP id q65KFMrZ008074; Thu, 5 Jul 2012 15:15:22 -0500 Original-Received: from dradamslap1 (/130.35.178.194) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 05 Jul 2012 13:15:22 -0700 X-Mailer: Microsoft Office Outlook 11 In-Reply-To: <3FE9DB99-982F-4442-9AFF-142650895368@Web.DE> Thread-Index: Ac1a40Z4b/qqGoqOQfSPelXqIinW9AABqjFg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Source-IP: acsinet21.oracle.com [141.146.126.237] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 1) X-Received-From: 141.146.126.227 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:85689 Archived-At: >*Help*...contains a hyper-link to holidays.el. Follow it! > Can you see the calculations? FWIW, I remember reading that code many years ago and being amazed by it - in particular, the Easter algorithm/definition. It involves both the moon and the sun: first Sunday after the first full moon after the Spring equinox (in the northern hemisphere). Definitely an interesting read. See also http://en.wikipedia.org/wiki/Easter.