Map Points Distance Calculator

Have you ever wondered how far it is between two given coordinates? Then this is the app for you, simply enter longitude and latitude for two points ans see the distance in kilometers and miles. You can also select the coordinates on a map.
The app is using the great-circle formula to calculate the distance.

The great-circle or orthodromic distance 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 length of a straight line between them, but on the sphere there are no straight lines. In non-Euclidean geometry, straight lines are replaced with geodesics. Geodesics on the sphere are the great circles (circles on the sphere whose centers coincide with the center of the sphere).