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

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Message #74 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, Nicholas Strauss <nicholas.strauss <at> gmail.com>
Subject: Re: bug#61460: 30.0.50; Calendar shows eclipse for quarter moon
Date: Tue, 14 Feb 2023 11:49:27 +0100

>>>>> On Tue, 14 Feb 2023, Michael Heerdegen wrote:

> AFAIU (rectangular spherical triangle) we should have something like

>  tan 𝚫u = tan 𝚫λ / cos i  [did I get it right?]

> (with u: argument of latitude, λ: ecliptic longitude, 𝚫 meaning distance
> from lunar node, i inclination (~ 5 degrees)).  The conversion does not
> make much of a difference.

I think this is correct. With cos i = 0.996, taking λ or u makes
little difference.

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