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Re: Wrong times for sunrise/sunset?

From: Marcin Borkowski
Subject: Re: Wrong times for sunrise/sunset?
Date: Sun, 20 Jan 2019 06:38:37 +0100
User-agent: mu4e 1.1.0; emacs 27.0.50

On 2019-01-19, at 20:17, Pierpaolo Bernardi <address@hidden> wrote:

> Il giorno 19 gennaio 2019, alle ore 16:27, Marcin Borkowski <address@hidden> 
> ha scritto:
>>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
> 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.)


Marcin Borkowski

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