The astronomical clock appeared towards the end of the 14th century. Some were indoors, but the most spectacular clocks were public outdoors, located in the heights of a cathedral, church, or public building. A few of these still exist. One can be seen at the Old Town Hall of Prague, the most famous, the third oldest, and the oldest still in function. The clock, inaugurated in 1410 and renovated in 1979, gives the local hour, the sidereal hour, the calendar and zodiac sign, the moon’s phase, and the sun’s position. To know more, see Wikipedia.