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Curiously, the Libra zodiac sign is absent from one of the oldest continuously running clocks in the world.
The astronomical clock of Padua, one of the oldest clocks in the world still in operation, is located atop the clock tower in Piazza dei Signori. It was constructed in 1344. The magnificent timepiece has a 24-hour dial, so the hour hand rotates fully only once per day, not twice, moving at half the usual speed, and starting at the right ("zero hour") rather than the top ("hour"). The designer, Jacopo de'Dondi, became so famous for this work that his family name was later changed to "Dondi dell'Orologio," or "Dondi of the Clock." The clock also rings a bell from one to twenty-four times every hour. The dial shows the day of the month, the current phase of the Moon, the motion of the planets, and the position of the Sun in the Zodiac. The dial displays the day of the month, the Moon's phase, the movement of the planets, and the Sun's sign in the zodiac.
