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.)
Moroccan units of measurement were variable, not rigidly defined. Some units included: 1 rotal = 507.5 g 1 artal = 507.5 g 1 gerbe = 3 kg 1 kula = 22 rotal 1 kantar = 100 rotal. One rotl of commerce was equal to 1.19 lb while one rotl of the markets was equal to 1.7 lbs. Several units were used. These units were variable, not rigidly defined. Some units included: 1 sahh = 56 l 1 fanega = 56 l 1 mudd = 14 l 1 almude = 14 l. Moroccan units of measurement A number of units of measurement were used in