Robert S.
Yelp
This magnificent clock is not just a timekeeper but also an impressive work of art that tells a story about the history of Prague and its people..Many call this one of the most over-hyped attractions in Europe, but I did find some interesting points after listening to our tour guide.
The Astronomical Clock was built in the 15th century and is the oldest working clock of its kind in the world. It consists of three main components: the astronomical dial, the calendar dial, and the figurines. The astronomical dial displays the position of the sun, the moon, and the stars, as well as the time of day. The calendar dial shows the current date, zodiac signs, and saints' days. Finally, the figurines perform every hour, with the twelve apostles appearing in a procession.
The clock face displays four different times, some recognizable and others ancient. Beginning on the outer edge of the dial, in deep blue, is Bohemian (or Old Czech) time shown in the Gothic numbers. The day consists of 24 hours and starts from the sunset (rather than midnight, as we'd use today). Bohemian time was utilized by Holy Roman Emperor Charles IV, and is pointed by the golden hand.
Next is Central European Time (CET) Zone, two sets of 12 hours shown in Roman numerals inside the Bohemian time numbers. CET is also indicated by the golden Sun hand.
Third is Babylonian (or Arabian) time, the oldest time displayed on the astronomical dial. Babylonian time, displayed in black Arabic numerals, separates the time between sunrise and sunset; that's why there are only 12 hours.
Finally, there's star time, or sidereal time. Sidereal uses the time it takes Earth to rotate once on its axis and return facing a distant star. Its time is 23 hours and 56 minutes, four minutes shorter than a solar day. A solar day is defined by when the Sun is overhead at noon, which must account for the Earth tracking one degree, or day, along its orbit around the Sun and hence is longer. Follow the little golden star among the Roman numerals for sidereal time. Now you are prepared to tell time via the stars or even back in the Middle Ages.
Fun piece of workmanship.