AVirtualMachineForExploringSpaceTimeAndBeyond : A point P and a triangle ABC, the four points being coplanar (Un point P et un triangle ABC, les quatre points etant coplanaires).

A point P and a triangle ABC, the four points being coplanar [Un point P et un triangle ABC, les quatre points étant coplanaires].

This is a very simplified explanation of the process used for the 'GPS' (Navstar Global Positionning System). In particular with the bidimensional one when obviously the actual 'GPS' is trdimensional and must take into accounts the special and general relativities!

[More information about the GPS -in english/en anglais-]
[Plus d'informations à propos du GPS -en français/in french-]

See the bidimensional process:

See the tridimensional process: