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
Ethiopian units of measurement Ethiopian units of measurement A number of different units of measurement have been used in Ethiopia. The values of the most of these units are not well defined. In 1963, Ethiopia adopted the metric system. These units have also been referred to as Abyssinian units of measurements. Different units were used to measure length. Values provided below are approximations only as these units were often not well-defined. 1 pic = 0.686 metres 1 farsang = 5070m 1 berri = 1/3 farsang (approx. 3 pics) A number of units were used to measure mass. One rottolo is approximately equal to 0.311