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
Maryland Route 852 Maryland Route 852 Maryland Route 852 (MD 852) is a collection of state highways in the U.S. state of Maryland. These 11 highways are service roads related to and sections of an old alignment of MD 31 between New Windsor and Manchester in Carroll County. Between Westminster and Manchester, the sections of MD 852 follow MD 27, which replaced MD 31 north of Westminster in 1967. MD 852 has three distinct sections of mainline highway: MD 852 runs from New Windsor to south of Westminster, MD 852K runs from south of Westminster into the county seat, and MD 852G runs