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According to Polhem's autobiography, the event that marked the beginning of his career was the successful repair of the unfinished medieval (16th century) astronomical clock by Petrus Astronomus at Uppsala Cathedral, which had remained unfinished and broken for more than a century.
The Gdańsk astronomical clock is a fifteenth-century astronomical clock in St. Mary's Church, Gdańsk.
The astronomical clock originated from Britain and the time ball was supplied by Siemens Brothers of Germany.
The Ploërmel Astronomical Clock is a 19th-century astronomical clock in Ploërmel.
Atkinson's mechanical skills led to a commission to design an astronomical clock for York Minster, the York Minster astronomical clock.
The astronomical clock designed by Richard of Wallingford in 1327 and built around 1354, also struck 24 hours.