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An hour (symbol: h; also abbreviated hr) is a unit of time historically reckoned as 1 ⁄ 24 of a day and defined contemporarily as exactly 3,600 seconds . There are 60 minutes in an hour, and 24 hours in a day. The hour was initially established in the ancient Near East as a variable measure of 1 ⁄ 12 of the night or daytime.
An hour (abbreviation: h or hr) is a unit of measurement used to measure time. An hour is equal to 60 minutes. 24 hours are equal to one day. Unlike the second, the hour is not a base SI unit . Wikimedia Commons has media related to Hour.
hide. Beginning. Keeping time. Clock displays. Analog clocks. Digital clocks. Sounds. Types of clocks. Clock. Analog clock. A clock is a device that tells the time. Some clocks can only show the time. Other clocks can show other things.
The 24-hour clock is a way of telling the time in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 23. It does not use a.m. or p.m.
2 days ago · hour (plural hours) A unit of time of one twenty-fourth of a day (sixty minutes ). I spent an hour at lunch. A season, moment, or time . ( poetic) The time . The hour grows late and I must go home. ( military, in the plural) Used after a two-digit hour and a two-digit minute to indicate time.
Article History. Related Topics: time. day. minute. unit. Notable Honorees: Paavo Nurmi. hour, in timekeeping, 3,600 seconds, now defined in terms of radiation emitted from atoms of the element cesium under specified conditions.
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00(:00) to 23(:59), with 24(:00) as an option to indicate the end of the day.
