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Minute and second of arc
A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree. As one degree is of a circle, one minute of arc is of a circle (or, in radians, ). It is used in fields that involve very small angles, such as astronomyoptometryophthalmologyopticsnavigationland surveying and marksmanship.

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WordNet 2.0 Dictionary

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1. a unit of angular distance equal to a 60th of a degree
(synonym) minute, minute of arc
(hypernym) angular unit
(part-holonym) degree, arcdegree
(part-meronym) second, arcsecond


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An angular measurement which corresponds to one sixtieth of a degree. Cf. arcsecond.

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