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 06:30:33 +0100 Message-ID: <875yc4q0ee.fsf@web.de> References: <87sffab61y.fsf@web.de> <87cz6eb10y.fsf@web.de> <87r0uu9e5v.fsf@web.de> <87mt5i9cba.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33841"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: 61460@debbugs.gnu.org To: Ulrich Mueller Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Feb 14 06:32:33 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 1pRnvd-0008ZF-9m for geb-bug-gnu-emacs@m.gmane-mx.org; 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Tue, 14 Feb 2023 06:30:34 +0100 In-Reply-To: (Ulrich Mueller's message of "Mon, 13 Feb 2023 10:34:00 +0100") X-Provags-ID: V03:K1:nSqgKtoNFfm8PXjc/ALN+5umWI5q58yCY34E5WpVx4nw7qlrKD/ XKQbxiUUEqDzpKuW4rFoxa1OpP1kQYyT0s+oN/kpbbe8LyOLyn80vnaLLVimrw+0Fupiwgb HUClswZZaJ0lpgNaBJxzDKxzTH3VosGu7z1C7NBmt4HLJj7oZh7it16ikR/FA1ywI19i3fM vnGxPfZqrAgIYf/K05xvw== UI-OutboundReport: notjunk:1;M01:P0:1Zu/FzooGcQ=;I4h0wZqDWWMbDjpCdp0vBczHXem AVN2xupx5tM8wLf3FFuXRSYN/sldZiF3CueMKDxpWZnhFxtQxfUpv3LcRdEitb3iYM8r2eMiZ XXkStSFtoGhgMQsXHRay704Gtf54CisylM+jyNcNjsf9+CIvkyL5BW0ZKEn9c8ndkpQ0QwlCC J/C1ZGhym+ejODb9ZCjgwURVooXOBekJyULm5eTai5a6X/kDeOTHydltT0sHuE16AIp9pq9SD bNpNLCbw6KLsUmihXzgvI1p+frMvHJFYOod59fUT+k8pby2R84/EQ/JOnepbOmaHsFNX2xaKu 2Gm8DE81g2nlSENCYucdSGxuUMihbSxLLatnQGpv/2pPJWrVxG2v1QUfeTlMWeUX1DxO0w4jd N9xTm2QMHMeUf+Y0iOK/O426U6xNRaw8fV05l8Me0WjE8ia6r+9wUyiyD3c6bG/yY9rbxvDRa e7rzcuvsHmy3LPf9KnxIIPLjPZtWDIGLZDjgdqgDjrBUeD/TtgfGvrBFy8Oc672y8QDt7S15+ Tx9uXdm2QVorTR5E2QIgZpDfrQ6gKw4a4RAo4KmEeigkhgZOR0rU1T6p9IkIaKZt6ri3tLiBb CMtvTq58ZyFdDGWqqRoedrdvasy0ckOfswZrCLeiD943ctIHj1TX5qfCSb+hhsHGKmZi9GRyJ ptCCGC6pAxiq8xQHCmMz/vyMwkjROtDvPWz88o2PeqfGx5eeNNqsKopaIkf1gUmkptJpXuk6m CL0znVsKXHkHxKBgu9aFmv9NTDOA6rNTN24U66YLEzCYIzx/cGiBzmugtOk/fPda8q7No8sh 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:255546 Archived-At: Ulrich Mueller writes: > https://en.wikipedia.org/wiki/Argument_of_latitude > | It is the sum of the more commonly used true anomaly and argument > | of periapsis. I did not find good discussions of the eclipse limits in the English Wikipedia version; I found good explanations in German however: https://de.wikipedia.org/wiki/Finsternis-Limit#Finsternis-Limite_bei_Sonnenfinsternissen https://de.wikipedia.org/wiki/Finsterniszyklus AFAIU you can indeed use similar values for lunar vs. solar eclipses. But in the case of the moon, we are then including penumbral lunar eclipses - in the total version see https://en.wikipedia.org/wiki/Total_penumbral_lunar_eclipse which are probably not really interesting (moon gets only a bit darker). The limits for an eclipse to happen are not really constant, but taking this into account is probably out of scope of the currently available code in lunar.el. Michael.