Q: I want to know the difference between meridian and parallel please.

A: A meridian (or line of longitude) is an imaginary arc on the Earth's surface from the North Pole to the South Pole that connects all locations running along it with a given longitude. The position of a point on the meridian is given by the latitude. [ Each meridian is perpendicular to all circles of latitude at the intersection points. Each is also the same size, being half of a great circle on

the Earth's surface and therefore measuring 20,003.93 km. Circles of latitude are often called parallels because they are parallel to each other. On some map projections, including the Equirectangular projection, they are drawn at equidistant intervals.
Circles of latitude become smaller the farther they are from the equator and the closer they are to the poles. A circle of latitude is perpendicular to all meridians at the points of intersection, and is hence a special case of a loxodrome. ]

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