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hour science definition
- A unit of time equal to one of the 24 equal parts of a day; 60 minutes.
♦ A sidereal hour is 1/24 of a sidereal day, and a mean solar hour is 1/24 of a mean solar day. See more at sidereal time, solar time. - A unit of measure of longitude or right ascension, equal to 15° or 1/24 of a great circle.
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