University of Heidelberg

Calendar tools

The Astronomisches Rechen-Institut has a long tradition in providing publishers of calendars with scientific data. In particular, we edit the annual volume Astronomische Grundlagen für den Kalender.
The user may find below some useful forms to help him to access calendar data.

Times of sunrise and sunset

Beginning and end of the civil twilight
(The centre of the sun is 6 degrees below the horizon)

Times of moonrise and moonset

Phases of the Moon
Day of the week
Calendar data for an entire year, including the movable feasts in Germany

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