# hour

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## hour

**1.**a period of time equal to 3600 seconds; 1/24th of a calendar day

**2.**

*Astronomy*an angular measurement of right ascension equal to 15° or a 24th part of the celestial equator

## hour

Symbol: h.**1.**A unit of time equal to 60 minutes, i.e. 1/24 of a day.

**2.**A unit of angle equal to 15° of arc, i.e. 1/24 of a circle. See right ascension.

## hour

[au̇r] (mechanics)

A unit of time equal to 3600 seconds. Abbreviated h; hr.

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