The arcminute (′) equals 1/60 of a degree, used in astronomy, cartography, and precision navigation where fine angular resolution is needed. Stars are cataloged by their coordinates in degrees and arcminutes, and telescope pointing accuracy is often specified in arcminutes. One arcminute equals 1/60 degree or about 0.000291 radians.

The arcsecond (″) equals 1/3,600 of a degree, providing extremely fine angular resolution for astronomy, optics, and satellite imaging. The Hubble Space Telescope has a resolution of about 0.05 arcseconds, and stellar parallax measurements use milliarcsecond precision. One arcsecond equals 1/3600 degree or about 0.00000485 radians.