From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.bugs Subject: bug#61460: 30.0.50; Calendar shows eclipse for quarter moon Date: Tue, 14 Feb 2023 10:15:59 +0100 Message-ID: <87y1p0obe8.fsf@web.de> References: <87sffab61y.fsf@web.de> <87cz6eb10y.fsf@web.de> <87r0uu9e5v.fsf@web.de> <87mt5i9cba.fsf@web.de> <875yc4q0ee.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20799"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: 61460@debbugs.gnu.org, Nicholas Strauss To: Ulrich Mueller Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Feb 14 10:17:22 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pRrRC-0005CH-C1 for geb-bug-gnu-emacs@m.gmane-mx.org; 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Tue, 14 Feb 2023 10:16:02 +0100 In-Reply-To: (Ulrich Mueller's message of "Tue, 14 Feb 2023 08:59:29 +0100") X-Provags-ID: V03:K1:uauGCbogNQODG/V/K1WcrGX2fEvvCEv+45cl2kk3CesN+RuiIS2 gCDjO6a+V1jzv/rcUn4wKudxjab/ZCi/y+lDQts9BYzvO6lEBFdPpyaQiOjOMhK5vdX4aSE /CF1WDlpRw7CYy1BDg8PkpP51OcXEG/IBX86iD7ckr5j9+mhn9CUQTzqqi9DG9B+kqSd93v mVj2PR+Y3Y/ZWDZdU5saQ== UI-OutboundReport: notjunk:1;M01:P0:MprTPD/80jM=;JOVrlfvEqfTVPtZZP2xTmUK2HVW hojMboFiIMJXmqatfczOIdP3dBfk3RpXC7LC1oOfwWklSzYS2AfhvYuPBAXFOmBDX6o/uqNRz MPVypz0N0kqmjyTPZqbtcq3FGpTNQJOV2g5ZlZLamQlsy4Zj0XTiYLmta78FlZLmXUu6Nr7Lv UcM5msc6jyo7jWqPjlIv8+ZNUbs2CBDRrFFRWqDG2QxRmCo/yaE430TzdbMCOcwJzxeJ3LTaa fjjYdWaCv9TQkoBUw+MZlZDrRvJSKHuL+2xdlJGMo0kNdgXNiDFqejCPY/9S5lz8DzXuqoPa0 pEVuNwSPKI2pJwkpSIKupDnuqAAsv4mvRY1xOsIz8znWG6NgP4wcSrxeZ7CXOAJJXb2kZUroR HiPy7l4rEEg8n4egXadoeT/X3YQ+8a/37+43gAoVfOm/qCa7ERetdAPOQVcoPlgWkW08QU2TX Cjfq3Mwc0ux6Ukk324GsVeQMe3hb9AkDlwmPdn3CbQ85fj4T3aunG0RTY7G+VXKrZWcxwwB3P XN+gKpb5e8UwiXKWNF7HkLfcFlv4PMUTeKIwDyZ0z2OP4BiYraqicEmCbABBW+tGzsvOAIp69 ljsH1G4kT8FLngMu252MauAMrZFCVPGN48jIE0GCKo6436ut3EM8xSRv5MRiK8dchcOmQw5lI whA2ms4x7dfwXqk077jRN0NWsk7Skysw4la4Iq1H47eVICQlEkJubRTZJCuchbJi6MN15BWID 41OFbvpyaQoYKu98JXrgCVc09WAglvyivJPfi+z49Ts/R8cD7NQ/5M9Q7Y+pxhMevAE/HR+x X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:255559 Archived-At: Ulrich Mueller writes: > I wonder why the angles in above explanation are completely different > from the ones given in eclipse-check: > > ((< moon-lat 2.42600766e-1) > (concat "** " phase-name " Eclipse **")) > ((< moon-lat 0.37) > (concat "** " phase-name " Eclipse possible **")) > > These are in radians. The first angle is 13.9=C2=B0 (exactly) and the > second one is 21.2=C2=B0. They are in argument of latitude, while (IIUC) > the angles in "Finsternis-Limit" are given in ecliptic longitude. > Still, with the moon's orbital inclination being only 5=C2=B0, one wouldn= 't > expect much of a difference there. Or am I missing something? Indeed, I wondered too about those numbers (also a bit about the format and the number of digits) and don't have an explanation. AFAIU (rectangular spherical triangle) we should have something like tan =F0=9D=9A=ABu =3D tan =F0=9D=9A=AB=CE=BB / cos i [did I get it right?] (with u: argument of latitude, =CE=BB: ecliptic longitude, =F0=9D=9A=AB mea= ning distance from lunar node, i inclination (~ 5 degrees)). The conversion does not make much of a difference. Michael.