Earth's circumference mile in the seventeenth century and the metre in the eighteenth. Earth's polar circumference is almost exactly 40,000 km because the metre was originally calibrated on this measurement (1/10-millionth of the distance between the poles and the equator), which is almost exactly 21,600 nautical miles (being defined as one minute of a degree – i.e. 360 multiplied by 60). It has been described as "the single most important measurement" of the Earth, assuming the Earth to be a sphere (the Earth is an technically an ellipsoid, albeit with just 0.3% flattening). Earth's circumference lines are the foundation of the coordinate
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