Prague astronomical clock

On the south side of the Old Town Hall in Prague, Czech Republic is a fascinating clock called the Orloj. It's an astronomical clock that displays the location of the earth, moon, sun, and planets in relation to the the signs of Zodiac. The clock dates to the Midieval era in 1410 when it was designed by a mathematics professor. The tower also has an hourly clock and a calendar dial, both added in 1490.

Detail of the calendar

In October the Orloj reached a 600-year milestone. It is a UNESCO World Heritage site.


http://en.wikipedia.org/wiki/Prague_Astronomical_Clock