Minute and second of arc

A minute of arc is one-sixtieth of a degree; a second of arc is one-sixtieth of a minute. These angular units subdivide a degree into finer measurements.

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Degree (angle): A unit of plane angle equal to one three-hundred-sixtieth of a full turn. The degree is the larger unit subdivided into minutes and seconds of arc.
Angular diameter: The apparent angle between the opposite edges of an object as seen from a point. Arc minutes describe the apparent sizes of the Moon, planets, and other objects.
Degree-minute-second notation: A notation that expresses an angle as degrees, minutes of arc, and seconds of arc. This notation writes the units as nested base-sixty parts of a degree.
Minute: A unit of time equal to sixty seconds. A minute of arc is angular, unlike the time unit with the same name.
Sexagesimal: A numeral system or measurement scheme based on powers of sixty. The sixty-to-one subdivisions follow the same base-sixty structure.
Astronomical seeing: The blurring of astronomical images caused by turbulence in Earth's atmosphere. Seeing is commonly reported as an image width measured in arcseconds.
Angular conversion: The conversion of an angle from one unit or representation to another. Conversion applies the sixty-to-one relationships between degrees, minutes, and seconds.
Second: The base unit of time in the International System of Units. A second of arc measures angle, not elapsed time.
Radian: The angle subtended at a circle's center by an arc equal in length to the radius. Radians measure angles through circle geometry rather than subdividing degrees.
Astrometry: The measurement of the positions and motions of celestial objects. Arcseconds and smaller units express the precision of celestial positions.