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
Rod (unit) parliament), an Anglicisation of the Lowland Scots "haly ruid" (holy cross), and also "The Dream of the Rood". Equivalent to - The rod was phased out as a legal unit of measurement in the United Kingdom as part of a ten-year metrication process that began on 24 May 1965. In the US, the rod, along with the chain, furlong, and statute mile (as well as the survey inch and survey foot) are based on the pre-1959 values for United States customary units of linear measurement. The Mendenhall Order of 1893 defined the yard as exactly meters, with all other units