Nautical mile 1 sea mile", followed by "For most practical purposes distance is measured from the latitude scale, assuming that one minute of latitude equals one nautical mile". One tenth of a nautical mile is a cable length. The derived unit of speed is the knot, defined as one nautical mile per hour. The metre was originally defined as of the meridian arc from the North pole to the equator passing through Dunkirk. The Earth’s circumference is therefore approximately 40,000 km. The equatorial circumference is slightly longer than the polar circumference – the measurement based on this (40,075.017 km x x =
U.S. Route 240 410 (East–West Highway), respectively, in the center of Bethesda. This intersection also served as the northern end of US 240 Alternate, which headed east along MD 410 to Connecticut Avenue, which was then MD 193 and is now MD 185. North of Bethesda, US 240 met the western end of MD 702 (Jones Bridge Road) just south of the National Naval Medical Center. The highway descended into the valley of Rock Creek then left the valley and met the western end of MD 547 (Strathmore Avenue). US 240 intersected Montrose Road and then the northern end of MD 187 (Old