Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to one-sixtieth (1/60) of one degree. As one degree is 1/360 of a turn (or complete rotation), one minute of arc is 1/21600 of a turn (or, in radians, ?/10800). A second of arc, arcsecond (arcsec), or arc second is 1/60 of an arcminute, 1/3,600 of a degree, 1/1,296,000 of a turn, and ?/648,000 (about 1/206,265) of a radian.