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

From: Eli Zaretskii <[email-masked]>
Date: Mon, 13 Feb 2023 05:24:47 +0200

> From: Ulrich Mueller <[email-masked]>
> Cc: [email-masked]
> Date: Sun, 12 Feb 2023 22:13:49 +0100
> 
> >>>>> On Sun, 12 Feb 2023, Eli Zaretskii wrote:
> 
> > Thanks, but what about
> 
> >   https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20414#14
> 
> > It sounds like the "impossible" argument was already voiced in that
> > discussion?
> 
> Indeed, and it was ignored. :(
> 
> An eclipse can only occur when the three bodies (Sun, Earth, and Moon)
> are in a straight line configuration. Which is the case for new moon and
> full moon, but not for quarter moon.
> 
> See also https://eclipse.gsfc.nasa.gov/LEdecade/LEdecade2021.html which
> lists 2023-05-05 and 2023-10-28 as the only dates of lunar eclipses in
> 2023, but _not_ 2023-01-28. That output of Calendar is definitely wrong.

Fine, then please install this on the emacs-29 branch (assuming all
the tests still pass after the change), and thanks.