Italian six-hour clock

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Six-hour clock at the Quirinal Palace, Rome

The six-hour clock (Italian: sistema orario a 6 ore), also called the Roman (alla romana) or the Italian (all'italiana) system, is a timekeeping system used in Italy. In this system, the day starts at the evening Ave Maria at the end of twilight, approximately half an hour after sunset, and the following 24 hours are divided into four cycles of six hours each.

Introduced by the Catholic Church in the 13th century, it remained in use in Italy until superseded by the 12-hour clock following the Napoleonic invasion of Italy.

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Further reading[edit]

  • Severino, Nicola (2011), La misteriosa storia degli orologi a sei ore. (in Italian)