Clock detail

Clock detail, originally uploaded by catb.

Astronomical clock, Staré Město, Prague, Czech Republic.

The clock consists of an astronomical dial, representing the position of the Sun and Moon in the sky, "The Walk of the Apostles", a clockwork hourly show of figures of the Apostles and other moving sculptures; and a calendar dial (part shown here) with medallions representing the months.
en.wikipedia.org/wiki/Prague_Astronomical_Clock