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second science definition
- A unit of time equal to 1/60 of a minute.
♦ A sidereal second is 1/60 of a sidereal minute, and a mean solar second is 1/60 of a mean solar minute. See more at sidereal time, solar time. - A unit of angular measurement, such as longitude or right ascension, equal to 1/60 of a minute of arc.
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