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  2. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The Roman day starting at dawn survives today in the Spanish word siesta, literally the sixth hour of the day (sexta hora). [ 11 ] The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime , terce , sext and none occur during the first ( prīma ) = 6 am, third ( tertia ) = 9 am, sixth ( sexta ) = 12 pm ...

  3. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    In medieval Europe, the Roman hours continued to be marked on sundials but the more important units of time were the canonical hours of the Orthodox and Catholic Church. During daylight, these followed the pattern set by the three-hour bells of the Roman markets, which were succeeded by the bells of local churches.

  4. Italian six-hour clock - Wikipedia

    en.wikipedia.org/wiki/Italian_six-hour_clock

    Six-hour clock at the Quirinal Palace, Rome. The six-hour clock (Italian: sistema orario a sei ore), also called the Roman (alla romana) or the Italian (all'italiana) system, is a system of date and time notation in Italy which was invented before the modern 24-hour clock.

  5. Unequal hours - Wikipedia

    en.wikipedia.org/wiki/Unequal_hours

    Unequal hours are the division of the daytime and the nighttime into 12 sections each, whatever the season. They are also called temporal hours, seasonal hours, biblical or Jewish hours, as well as ancient or Roman hours (Latin: horae temporales). They are unequal duration periods of time because days are longer and nights shorter in summer ...

  6. Canonical hours - Wikipedia

    en.wikipedia.org/wiki/Canonical_hours

    By the time of Saint Benedict of Nursia, author of the Rule, the monastic Liturgy of the Hours was composed of seven daytime hours and one at night. He associated the practice with Psalm 118/119:164, "Seven times a day I praise you", and Psalm 118/119:62, "At midnight I rise to praise you". [ 22 ]

  7. Relative hour - Wikipedia

    en.wikipedia.org/wiki/Relative_hour

    In Roman times, these daylight hours were known as unequal hours. In the Modern Age of astral science and of precise astronomical calculations, it is now possible to determine the length of the ever-changing hour by simple mathematics. To determine the length of each relative hour, one needs but simply know two variables: (a) the precise time ...

  8. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    The 24-hour clock is the most commonly used method worldwide to physically represent the time of day. Some regions utilize 24-hour time notation in casual speech as well, such as regions that speak German, French, or Romanian, though this is less common overall; other countries that utilize the 24-hour clock for displaying time physically may ...

  9. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The time was determined by observing particular stars as they crossed the meridian. [24] The Jantar Mantar in Jaipur built in 1727 by Jai Singh II includes the Vrihat Samrat Yantra, 88 feet (27 m) tall sundial. [25] It can tell local time to an accuracy of about two seconds. [26]