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 U.S. Route 240 U.S. Route 240 is a defunct designation for a short, but once very important, segment of highway between Frederick, Maryland and Washington, D.C. This route description features US 240 as it existed in 1945, with references to today's highways to provide context. US 240 began at the intersection of Pennsylvania Avenue and 14th Street near the White House in Washington. US 1 followed 14th Street through the intersection. Pennsylvania Avenue east of US 1 was part of District of Columbia Routes 4 and 5, which ran concurrently along Pennsylvania Avenue southeast around the Capitol and across the