Geographical mile longitude at the equator is thus exactly 60 geographical miles. It was closely related to the nautical mile, which was originally determined as 1 minute of arc along a great circle of the Earth, but is nowadays defined as exactly 1852 metres. The US National Institute of Standards and Technology (NIST) notes that: "The international nautical mile of 1 852 meters (6 076.115 49...feet) was adopted effective July 1, 1954, for use in the United States. The value formerly used in the United States was 6 080.20 feet = 1 nautical (geographical or sea) mile." (6080.2 feet is 1853.24496 meters.)
Mexican units of measurement Mexican units of measurement A number of units of measurement were used in Mexico to measure length, mass, area, capacity, etc. The Metric system was optional from 1857, and has been compulsory since 1896. The Units of the system (from Spanish, Castillian) were legally defined during the transition period of the metric system. A number of units were used. One vara (lit. "pole") was equal to 0.838m (32.99 inches) as it was legally defined also use inches and feet. Some other units and legal equivalents are given below: 1 linea (lit. "line") = 1/432 vara 1 pulgada (lit. "thumbful", "inch")