This astronomical clock was built in 1472 by Hans Düringer and is the only one of its kind still in working condition with its original clockworks. It is placed in St. Mary’s church (Marienkirche), the biggest of three town churches found in the Hanseatic city of Rostock.
A fascinating detail of the clock is this calendar showing each date from 1885 up to 31st Decemer 2017. Beside religious dates there are also details like the time of sunrises for each day mentioned. The current calendar disc is already the fourth one. The first calendar disc started around 1470/72.
By the way, nobody has to fear that the world will end on January 1st, 2018. During my visit in June 2016, a new calendar disc waited in the sacristy for its use. This disc will then apply for the next 133 years.