Useful links related to the calendar

Some information on the times of rising and setting of the Sun and Moon, the phases of the Moon, the date of Easter, and related topics may be found by the following links. Our list is extremely incomplete.

The website of the U.S. Naval Observatory http://aa.usno.navy.mil, see under Data Services.
- In particular, one obtains:

The website of the Institut de Mécanique céleste et de calcul des éphémérides http://www.imcce.fr/imcce.php?lang=fr (in French), or http://www.imcce.fr/imcce.php?lang=en (in English).
- For example, one finds under Astronomie pour tous
  - The phases of the Moon:
    http://www.imcce.fr/page.php?nav=fr/ephemerides/astronomie/phases_lune/index.php
  - The seasons:
    http://www.imcce.fr/page.php?nav=fr/ephemerides/astronomie/saisons/index.php
  - The date of Easter:
    http://www.imcce.fr/page.php?nav=fr/ephemerides/astronomie/dates_paques/index.php
- High-accuracy ephemerides are provided at
  - http://www.imcce.fr/page.php?nav=fr/ephemerides/formulaire/form_ephepos.php

Resources:
- Claus Tøndering's Calendar FAQ:
  - http://www.tondering.dk/claus/calendar.html
- Nikolaus A. Bär's website (in German):
  - http://www.nabkal.de/index.html
- Herbert Metz: Calendar and computus (in German)
  - http://www.computus.de
- Holger Oertel: Various calendars (in English):
  - http://www.ortelius.de/kalender/idx_en.php
- For sky maps and other useful tools, see the following link.
  - http://www.heavens-above.com

Contact: R. Bien / D. Möricke