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Wiktionary
minute of arc

n. An angle, one sixtieth (1/60th) of a degree.

WordNet
minute of arc

n. a unit of angular distance equal to a 60th of a degree [syn: minute, arcminute]

Usage examples of "minute of arc".

The perimeter of the Great Pyramid equals exactly one-half minute of arc—.

Out at Neptune, the Sun subtends only one minute of arc in the sky, and the intensity of sunlight is one nine-hundredth of what we experience here.