User:Nolann Emmanuel/sandbox

Locating Places During ancient times, locating places depends on observation of Celestial Bodies which is called Celestial Navigation Celestial navigation, also known as astronavigation, is the ancient art and science of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations. Distances on earth are expressed in angular measurement, so the unit degree is used A Degree of Latitude and Longitude is equal to 70 Miles (112 km) Each degree is divided into equal parts called minutes. A minute of a Latitude or Longitude is equivalent to 1.1667 Miles (also called Nautical Mile) A minute is divided into equal parts called seconds A second of a Latitude or Longitude is equal to 100 ft. HISTORY The invention of a Geographic Coordinate System is generally credited to Erathosthenes of Cyrene, who composed his Geography at the Library of Alexandria in the 3rd Century BC At the 4th Century BC, Hipparchus of Nicaea improved Erathosthenes’ system by adding latitude and longitude In the 9th Century Al Khwarizmi composed the book The Description of the Earth. A geographic coordinate system is a coordinate system that enables every location on the Earth to be specified by a set of numbers or letters, or symbols. The coordinates are often chosen such that one of the numbers represents vertical position, and two or three of the numbers represent Horizontal position. A common choice of coordinates is Latitude and Longitude. To specify a location on a two-dimensional map requires a map projection $$≅$$