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The great-circle distance, orthodromic distance, or spherical distance is the distance along a great circle . It is the shortest distance between two points on the surface of a sphere, measured along the surface of the sphere (as opposed to a straight line through the sphere's interior). The distance between two points in Euclidean space is the ...
Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...
The skyscrapers of Center City, Philadelphia, the downtown part of the city, from the South Street Bridge. New York City, Chicago, and Philadelphia are the only incorporated places in the United States that have a population over 1,000,000 and a population density over 10,000 people per square mile. Population.
Passenger trains are limited to 59 mph and freight trains to 49 mph on track without block signal systems. (See dark territory .) Trains without "an automatic cab signal, automatic train stop or automatic train control system "may not exceed 79 mph." The order was issued in 1947 (effective December 31, 1951) by the Interstate Commerce ...
The distance between two points in physical space is the length of a straight line between them, which is the shortest possible path. This is the usual meaning of distance in classical physics, including Newtonian mechanics. Straight-line distance is formalized mathematically as the Euclidean distance in two- and three-dimensional space.
The frequency of mileage signs do differ between rural/countryside areas, cities, and the suburbs. They are much more common in the countryside compared to cities because most drivers simply pass through these regions on a major highway to get to their destination, letting them know how far they are from the nearest major town, village, or city ...
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