[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#61460: 30.0.50; Calendar shows eclipse for quarter moon
From: |
Michael Heerdegen |
Subject: |
bug#61460: 30.0.50; Calendar shows eclipse for quarter moon |
Date: |
Tue, 14 Feb 2023 10:15:59 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Ulrich Mueller <ulm@gentoo.org> writes:
> I wonder why the angles in above explanation are completely different
> from the ones given in eclipse-check:
>
> ((< moon-lat 2.42600766e-1)
> (concat "** " phase-name " Eclipse **"))
> ((< moon-lat 0.37)
> (concat "** " phase-name " Eclipse possible **"))
>
> These are in radians. The first angle is 13.9° (exactly) and the
> second one is 21.2°. They are in argument of latitude, while (IIUC)
> the angles in "Finsternis-Limit" are given in ecliptic longitude.
> Still, with the moon's orbital inclination being only 5°, one wouldn't
> expect much of a difference there. Or am I missing something?
Indeed, I wondered too about those numbers (also a bit about the format
and the number of digits) and don't have an explanation.
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.
Michael.
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, (continued)
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Mueller, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Mueller, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Eli Zaretskii, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Mueller, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Eli Zaretskii, 2023/02/13
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/14
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Mueller, 2023/02/14
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon,
Michael Heerdegen <=
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Müller, 2023/02/14
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/14
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Müller, 2023/02/16
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/17
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Müller, 2023/02/17
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/17
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/18
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Ulrich Mueller, 2023/02/18
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/18
- bug#61460: 30.0.50; Calendar shows eclipse for quarter moon, Michael Heerdegen, 2023/02/21