From: Marcin Borkowski <mbork@mbork.pl>
To: Pierpaolo Bernardi <olopierpa@gmail.com>
Cc: "help-gnu-emacs@gnu org" <help-gnu-emacs@gnu.org>
Subject: Re: Wrong times for sunrise/sunset?
Date: Sun, 20 Jan 2019 06:38:37 +0100 [thread overview]
Message-ID: <87k1izoplu.fsf@mbork.pl> (raw)
In-Reply-To: <hxb4h171gxq0fe6owlncxn98.1547925456372@email.android.com>
On 2019-01-19, at 20:17, Pierpaolo Bernardi <olopierpa@gmail.com> wrote:
> Il giorno 19 gennaio 2019, alle ore 16:27, Marcin Borkowski <mbork@mbork.pl> ha scritto:
>
>>Hello,
>>C-u M-x sunrise-sunset (and today's date) says
>
>>I also noticed that other online services give yet other results.
>>Anybody knows why the difference(s)?
>
> See https://lists.gnu.org/archive/html/help-gnu-emacs/2016-07/msg00321.html
>
> Hth
Yes, that helps, thanks.
Out of curiosity - Michael Heerdegen writes there:
--8<---------------cut here---------------start------------->8---
AFAIK the Emacs calculation is exact - it respects all astronomical
effects I know of. But it doesn't try hard to round to whole minutes
correctly, so the result may differ from the actual event by an epsilon,
where epsilon < 1 min I think.
--8<---------------cut here---------------end--------------->8---
But the differences I can see are a few minutes. Why, after takign care
of all astronomical effects, is "rounding to whole minutes correctly"
even an issue?
(I understand that I know very little abot time calculations and such,
and I understand they are difficult. I'd just like to know.)
Best,
--
Marcin Borkowski
http://mbork.pl
next prev parent reply other threads:[~2019-01-20 5:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-19 19:17 Wrong times for sunrise/sunset? Pierpaolo Bernardi
2019-01-20 5:38 ` Marcin Borkowski [this message]
-- strict thread matches above, loose matches on Subject: below --
2019-01-26 2:02 Van L
2019-01-19 15:25 Marcin Borkowski
2019-01-20 5:52 ` ken
2019-01-20 6:10 ` Marcin Borkowski
2019-01-20 7:17 ` Bob Proulx
2019-01-24 17:04 ` Marcin Borkowski
2019-01-20 15:00 ` Óscar Fuentes
2019-01-24 17:01 ` Marcin Borkowski
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