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Informal rush hours and happy hours cover the times of day when commuting slows down due to congestion or alcoholic drinks are available at discounted prices. respectively on that day at geographical latitudes near 57.5°, roughly the latitude of Aberdeen or Sitka, Alaska.The hour record for the greatest distance traveled by a cyclist within the span of an hour is one of cycling's greatest honors. This animation depicts the motion of the shadow from 3 a.m. on mid-summer's day, when the Sun is at its highest declination (roughly 23.5°). Many different ways of counting the hours have been used.Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of clock.and also would have had twelve months in each of its years.During the French Revolution, a general decimalization of measures was enacted, including decimal time between 17. This hour was only briefly in official use, being repealed by the same 1795 legislation that first established the metric system.
When mechanical clocks began to be used to show hours of daylight or nighttime, their period needed to be changed every morning and evening (for example, by changing the length of their pendula).
The ancient Greeks and Romans originally divided the day into 12 hours and the night into 3 or 4 night watches.
They were notionally deified as the Horae, although sometimes only as a triad.
During the New Kingdom, another system of decans was used, made up of 24 stars over the course of the year and 12 within any one night.
The later division of the day into 12 hours was accomplished by sundials marked with ten equal divisions.
This reckons each of a day's 24 hours apart from noon as part of a fourth of the day.