′
arcminute
Angleexact by definition
The arcminute is exactly 1/60 of a degree, or 1/21,600 of a full turn. It is used in navigation, surveying and astronomy where whole degrees are too coarse. The definition is exact, though the radian value 2.9089 × 10⁻⁴ is irrational and rounded here.
| 1 ′ | 0.016666667 ° |
Where the unit came from
The name comes from the Latin pars minuta prima, the "first small part" of a degree, the same phrase that gave the minute of time. On the Earth's surface, one arcminute of latitude is one nautical mile by construction.
Solvers that use angle