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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, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour.
The verse Domine, labia mea aperies et os meum annuntiabit laudem tuam is sung at the opening of the first canonical hour of the day. Lauds is a canonical hour of the Divine office. In the Roman Rite Liturgy of the Hours it is one of the major hours, usually held after Matins, in the early morning hours (between 3:00:00 and 5:59:59).
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.
Although the division of hours into minutes and seconds did not occur until the Middle Ages, Classical astrologers had a minuta equal to 1 ⁄ 60 of a day (24 modern minutes), a secunda equal to 1 ⁄ 3600 of a day (24 modern seconds), and a tertia equal to 1 ⁄ 216,000 of a day (0.4 modern seconds).
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 ...
Under its provisions, the French hour (French: heure) was 1 ⁄ 10 of the day and divided formally into 100 decimal minutes (minute décimale) and informally into 10 tenths . Mandatory use for all public records began in 1794, but was suspended six months later by the same 1795 legislation that first established the metric system.
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10 times the length of the previous cosmological decade, with CD 1 beginning either 10 seconds or 10 years after the Big Bang, depending on the definition. eon: 10 9 yr: Also refers to an indefinite period of time, otherwise is 1 000 000 000 years. kalpa: 4.32 × 10 9 yr: Used in Hindu mythology. About 4 320 000 000 years. exasecond: 10 18 s ...