File:AnalogClockAnimation1_2hands_1h_in_6sec.gif · Wikimedia Commons · See Wikimedia Commons

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hour

Also known as h, hr, hrs, hours, 60 minutes, sixty minutes

thumb|Midnight to 1 a.m. on a 24-hour clock with a digital face

AI overview

An hour is a unit of time equal to 60 minutes, and it's one of the 24 equal divisions that make up a full day. Hours matter because they provide a standardized way to measure and organize time, allowing people to schedule activities, coordinate with others, and structure their daily routines.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Unit.name: hour
Unit.image: AnalogClockAnimation1 2hands 1h in 6sec.gif
Unit.caption: Midnight (or noon) to 1 on a 12-hour clock with an analogue face
Unit.symbol: h
Unit.symbol2: hr
Unit.standard: Non-SI units accepted for use with SI
Unit.quantity: time
Unit.units1: SI units
Unit.units2: Non-SI units

via Wikipedia infobox

~25 min read

Encyclopedic overview

25 sections

Contents

Etymology
History
Antiquity
Ancient Egypt
Ancient Greece
Middle Ages
Modernity
Counting hours
Counting from dawn
Unequal hours
Counting from sunset
Counting from noon
Counting from midnight
History of timekeeping in other cultures
Egypt
East Asia
Southeast Asia
India
Derived measures
See also
Explanatory notes
Citations
General and cited references
Further reading
External links

thumb|Midnight to 1 a.m. on a 24-hour clock with a digital face

An hour (symbol: h; also abbreviated hr) is a unit of time historically reckoned as of a day and defined contemporarily as exactly 3,600 seconds (SI). There are 60 minutes in an hour, and 24 hours in a day.

Excerpted from Wikipedia’s “hour” article, available under the CC BY-SA 4.0 licence.