From: Michael Heerdegen <michael_heerdegen@web.de>
To: "Ulrich Müller" <ulm@gentoo.org>
Cc: 61460@debbugs.gnu.org
Subject: bug#61460: 30.0.50; Calendar shows eclipse for quarter moon
Date: Mon, 13 Feb 2023 06:13:49 +0100 [thread overview]
Message-ID: <87cz6eb10y.fsf@web.de> (raw)
In-Reply-To: <87sffab61y.fsf@web.de> (Michael Heerdegen's message of "Mon, 13 Feb 2023 04:25:13 +0100")
Michael Heerdegen <michael_heerdegen@web.de> writes:
> My questions: [...]
BTW (3), I also don't understand those conversions of the latitude:
#+begin_src emacs-lisp
(defun eclipse-check (moon-lat phase)
(let* ((moon-lat (* (/ float-pi 180) moon-lat))
(moon-lat (abs (- moon-lat (* (floor (/ moon-lat float-pi))
float-pi))))
(moon-lat (if (> moon-lat 0.37)
(- float-pi moon-lat)
moon-lat))
(...))
(...)))
#+end_src
What does this do? Don't we just want to convert a value in [0 360) to
one in [-pi pi] and use the absolute value of that, or so? That would
look like
(abs (* (/ float-pi 180) (- moon-lat 180)))
Why is our calculation so complicated?
Michael.
next prev parent reply other threads:[~2023-02-13 5:13 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-12 19:57 bug#61460: 30.0.50; Calendar shows eclipse for quarter moon Ulrich Mueller
2023-02-12 20:07 ` Ulrich Müller
2023-02-12 20:19 ` Eli Zaretskii
2023-02-12 21:13 ` Ulrich Mueller
2023-02-13 3:24 ` Eli Zaretskii
2023-02-13 3:25 ` Michael Heerdegen
2023-02-13 4:52 ` Michael Heerdegen
2023-02-13 5:13 ` Michael Heerdegen [this message]
2023-02-13 6:01 ` Michael Heerdegen
2023-02-13 7:28 ` Ulrich Mueller
2023-02-13 8:13 ` Michael Heerdegen
2023-02-13 8:52 ` Michael Heerdegen
2023-02-13 9:34 ` Ulrich Mueller
2023-02-13 10:04 ` Michael Heerdegen
2023-02-13 13:03 ` Eli Zaretskii
2023-02-13 13:30 ` Ulrich Mueller
2023-02-13 14:05 ` Eli Zaretskii
2023-02-14 5:30 ` Michael Heerdegen
2023-02-14 7:59 ` Ulrich Mueller
2023-02-14 9:15 ` Michael Heerdegen
2023-02-14 10:22 ` Ulrich Müller
2023-02-14 10:56 ` Michael Heerdegen
2023-02-16 20:26 ` Ulrich Müller
2023-02-17 5:25 ` Michael Heerdegen
2023-02-17 7:03 ` Ulrich Müller
2023-02-17 7:20 ` Michael Heerdegen
2023-02-18 5:53 ` Michael Heerdegen
2023-02-18 8:56 ` Ulrich Mueller
2023-02-18 9:16 ` Michael Heerdegen
2023-02-21 15:15 ` Michael Heerdegen
2023-02-22 9:00 ` Ulrich Mueller
2023-02-22 9:45 ` Andreas Schwab
2023-02-22 10:03 ` Michael Heerdegen
2023-02-22 11:32 ` Ulrich Mueller
2023-02-22 14:19 ` Michael Heerdegen
2023-02-22 15:46 ` Ulrich Mueller
2023-02-22 16:26 ` Michael Heerdegen
2023-02-25 16:13 ` Michael Heerdegen
2023-02-14 13:31 ` Eli Zaretskii
2023-02-14 10:49 ` Ulrich Mueller
2023-02-13 6:21 ` Ulrich Mueller
2023-02-13 7:08 ` Michael Heerdegen
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