The Astronomical Clock of St. Mary's Church in Rostock, Germany, was built in 1472.
It still functions with its original clockwork and shows exact time, and also numerous additional data like Easter date, weekdays, lunar phase, etc.

This repository serves as an archive for images and sound, technical manuals, research papers and media reports concerning this clock. 
For copyright reasons, a good part of the content is available to registered users only.

Inquiries to the webmaster.