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This module is composed of several functions useful
for performing calculations on a sphere, such as distance or projections.
A part of them has been adapted from:
http://www.movable-type.co.uk/scripts/latlong.html

Functions frequently used by other modules:

- *haversine*: a function to compute the shortest path distance
  between two points on a sphere
- *prog_point*: a function to compute the localization of a point(more...)