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
Unit of measurement is the same length regardless of temperature, but a metal bar will be exactly one metre long only at a certain temperature. There are certain rules that have to be used when dealing with units: Conversion of units involves comparison of different standard physical values, either of a single physical quantity or of a physical quantity and a combination of other physical quantities. Starting with: just replace the original unit formula_9 with its meaning in terms of the desired unit formula_10, e.g. if formula_11, then: Now formula_13 and formula_14 are both numerical values, so just calculate their product. Or, which