geographical mile

noun2

1. •
   A unit of length corresponding to exactly one minute of arc (1/60 degree) along the Earth's equator, about 1855.4 meters, 2029.1 yards, or roughly 8/7 international miles.

   • The equator is exactly 21,600 geographical miles long, about 40,075 km or 24,901 miles.
2. •
   Synonym of nautical mile, exactly 1,852 meters.