Arc Minute
An angular measurement equal to 1/60th of a degree.
A minute of arc, arcminute, or minute arc (MOA), is a unit of angular
measurement equal to
one sixtieth (1⁄60) of one degree(circle⁄21,600),
or (π⁄10,800) radians. In turn, a second of arc or arcsecond is one sixtieth (1⁄60) of one minute of arc. Since
one degree is defined as one three hundred and sixtieth (1⁄360) of a rotation, one minute
of arc is 1⁄21,600 of a rotation. It is used in those
fields which require a unit for the expression of small angles, such as astronomy, navigation and marksmanship.
The number of square arcminutes in a complete
sphere is
or approximately 148,510,660.498 square
arcminutes.
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