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Wrong times for sunrise/sunset?


From: Marcin Borkowski
Subject: Wrong times for sunrise/sunset?
Date: Sat, 19 Jan 2019 16:25:40 +0100
User-agent: mu4e 1.1.0; emacs 27.0.50

Hello,

C-u M-x sunrise-sunset (and today's date) says:

--8<---------------cut here---------------start------------->8---
Sat, Jan 19, 2019: Sunrise 7:54am (CET), sunset 4:13pm (CET) at Poznań,
Poland (8:19 hrs daylight)
--8<---------------cut here---------------end--------------->8---

Here are my settings:

--8<---------------cut here---------------start------------->8---
(setq calendar-latitude 52.4)
(setq calendar-longitude 16.917)
(setq calendar-location-name "Poznań, Poland")
--8<---------------cut here---------------end--------------->8---

(BTW, if anyone is ever near here, please drop me a line - we might be
able to meet in person;-)).

And C-u M-: calendar-time-zone says (correctly) 60.

However, https://www.timeanddate.com/astronomy/poland/poznan (for today)
says:

--8<---------------cut here---------------start------------->8---
Sunrise Today: 07:51↑ 124° Southeast
Sunset Today: 16:14↑ 237° Southwest
--8<---------------cut here---------------end--------------->8---

I also noticed that other online services give yet other results.

Anybody knows why the difference(s)?

TIA,

--
Marcin Borkowski
http://mbork.pl



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