BONUS QUESTION if we approximate Earth as an Ellipsoid find

BONUS QUESTION: if we approximate Earth as an Ellipsoid, find the shortest distance between the two points on the surface of that ellipsoid (i.e. you must define the parameters of the ellipsoid) once for each datum. Define and explain what this distance on the ellipsoid represents and its significance. (40%)

Solution

http://www.numericana.com/answer/ellipsoid.htm#ellipsoid