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
Marla (unit) Marla (unit) A marla is a unit of area used in the Indian subcontinent. The marla is a traditional unit of area that is used in India, Pakistan and Bangladesh. The marla was standardized under British rule to be equal to the square rod, or 272.25 square feet, 30.25 square yards, or 25.2929 square metres. As such, it was exactly one 160th of an acre. The definition of marla varies between India and Pakistan. In India, the unit was standardized to 25 square yards. Its use in India is in decline, with the guz, square meter, acre and hectare being