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
Obsolete Russian units of measurement as the pood is used when referencing the weight of a kettlebell, a Russian invention, especially in CrossFit. The Imperial Russian apothecaries' weight was defined by setting the grain () to be exactly seven-fifths of a "dolia". The only unit name shared between the two was the "funt" (pound), but the one in the apothecaries' system is exactly seven-eighths of the ordinary "funt". The obsolete units of measurement survived in Russian culture in a number of idiomatic expressions and proverbs, for example: Obsolete Russian units of measurement A native system of weights and measures was used in Imperial Russia and