Geodetic connexion between France and North Africa by simultaneous sighting of the echo artificial satellite
Résumé
The basic principle is very simple: a luminous object is seen against a different star background according to the observer's position on the earth's surface. It can be seen that a photograph of this luminous object and the surrounding stars, will give information which permit the finding of the position of the point on the earth's surface, on the assumption that the positions of other observations points are known.