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

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Message #47 received at 61460 <at> debbugs.gnu.org (full text, mbox):

From: Ulrich Mueller <ulm <at> gentoo.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 61460 <at> debbugs.gnu.org
Subject: Re: bug#61460: 30.0.50; Calendar shows eclipse for quarter moon
Date: Mon, 13 Feb 2023 10:34:00 +0100

>>>>> On Mon, 13 Feb 2023, Michael Heerdegen wrote:

>> Ok, thanks.  So the input value is the longitude?

> Which (unless I'm misunderstanding in what coordinate system we are
> here) would be bad, since the longitude of the lunar nodes is not
> constant (the nodes travel along the ecliptic in only 18.6 years)...?

No, it is the "argument of latitude" (and yes, the nomenclature is
slighly confusing). Its value is 0° for the ascending node, which is
what we want.

https://en.wikipedia.org/wiki/Argument_of_latitude
| It is the sum of the more commonly used true anomaly and argument
| of periapsis.

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