The first foundations of the castle date from the eleventh and twelfth centuries, while construction on the main tower, the Zytturm, began around 1300 and was completed with the construction of the astronomical clock in 1574.
The arrow indicates the day of the week on the inner ring of the dial, on which the days of the week are represented by their Germanic deities and astrological signs, with Sunday at the top.
The rulers of the days of the week follow the classical Vedic and Hellenistic tradition: Sunday - Sun; Monday - Moon; Tuesday - Mars; Wednesday - Mercury; Thursday - Jupiter; Friday - Venus; Saturday - Saturn.
The crescent moon indicates the lunar phase, pointing upwards at the new moon and downwards at the full moon. The sun indicates the sign of the zodiac on the outer ring of the dial, starting with Capricorn at bottom (between 6 and 7 o'clock) for January.
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