From: Michael Heerdegen <michael_heerdegen@web.de>
To: Ulrich Mueller <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 09:13:00 +0100 [thread overview]
Message-ID: <87r0uu9e5v.fsf@web.de> (raw)
In-Reply-To: <u4jrqc9cy@gentoo.org> (Ulrich Mueller's message of "Mon, 13 Feb 2023 08:28:29 +0100")
Ulrich Mueller <ulm@gentoo.org> writes:
> IIUC, the goal is to calculate the angular distance from the ascending
> or descending node, whichever is closer. So one wants this:
>
> 0° -> 0°
> 10° -> 10°
> ...
> 170° -> 10°
> 180° -> 0°
> 190° -> 10°
> ...
> 350° -> 10°
Ok, thanks. So the input value is the longitude?
> The only thing that I don't understand is the constant 0.37. I would
> have expected pi/2 (= 90°) there. Probably it doesn't matter, because
> below it checks for (< moon-lat 0.37), so any larger value will be
> ignored.
Maybe you gained slightly faster code on a really old computer - the
book that is mentioned in the code is quite old. In theory this allows
you to get rid of one `if' statement (the comparison against 0.37 is
performed anyway). And yes, it doesn't affect the result.
Michael.
next prev parent reply other threads:[~2023-02-13 8:13 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
2023-02-13 6:01 ` Michael Heerdegen
2023-02-13 7:28 ` Ulrich Mueller
2023-02-13 8:13 ` Michael Heerdegen [this message]
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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