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.)
History of measurement systems in Pakistan were standardized so that the Kanal equals exactly 605 square yards or 1/8 acre; this is equivalent to about 505.857 square meters. A Kanal is equal to 20 marlas. The Marla (unit) is a traditional unit of area that was used in Pakistan and Marla was standardized under British rule to be equal to the square rod, or 272.25 square feet, 30.25 square yards, or 25.2929 square metres. As such, it was exactly one 160th of an acre. Paher, is a traditional unit of time used in South Asia, including Pakistan. One "pahar" nominally equals three hours, and there are