GNU bug report logs - #61460
30.0.50; Calendar shows eclipse for quarter moon

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Package: emacs;

Reported by: Ulrich Mueller <ulm <at> gentoo.org>

Date: Sun, 12 Feb 2023 19:58:02 UTC

Severity: normal

Found in version 30.0.50

Fixed in version 30.1

Done: Ulrich Müller <ulm <at> gentoo.org>

Bug is archived. No further changes may be made.

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Message #29 received at 61460 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Ulrich Müller <ulm <at> gentoo.org>
Cc: 61460 <at> debbugs.gnu.org
Subject: Re: bug#61460: 30.0.50; Calendar shows eclipse for quarter moon
Date: Mon, 13 Feb 2023 07:01:15 +0100

Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> Why is our calculation so complicated?

Why the is latitude of the moon:

#+begin_src emacs-lisp
(moon-lat (mod
            (+ 21.2964
               (* 390.67050646 index)
               (* -0.0016528 time time)
               (* -0.00000239 time time time))
            360.0))
#+end_src

calculated as a mod 360.0 value?  I would expect this for the longitude,
latitude should be in -90°...90° AFAIU.  Is it a typo?

Michael.
This bug report was last modified 2 years and 88 days ago.

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