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bug#61460: 30.0.50; Calendar shows eclipse for quarter moon

From: Ulrich Mueller
Subject: bug#61460: 30.0.50; Calendar shows eclipse for quarter moon
Date: Tue, 14 Feb 2023 11:49:27 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) 
>>>>> 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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