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: Tue, 14 Feb 2023 06:30:33 +0100 [thread overview]
Message-ID: <875yc4q0ee.fsf@web.de> (raw)
In-Reply-To: <uzg9hc3jr@gentoo.org> (Ulrich Mueller's message of "Mon, 13 Feb 2023 10:34:00 +0100")
Ulrich Mueller <ulm@gentoo.org> 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.
next prev parent reply other threads:[~2023-02-14 5:30 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
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 [this message]
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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