Postcards from Prague
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#4 Astronomical Clock
The Prague Astronomical Clock or Prague Orloj is a medieval astronomical clock mounted on the southern wall of Old Town City Hall in the Old Town Square and is a popular tourist attraction. The Orloj is composed of three main components: the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; "The Walk of the Apostles", a clockwork hourly show of figures of the Apostles and other moving sculptures; and a calendar dial with medallions representing the months.
See Wikipedia, Prague Astronolmical Clock, http://en.wikipedia.org/wiki/Prague_Astronomical_Clock