Upgrading from:

Miscellaneous`Geodesy`

All the functionality in Miscellaneous`Geodesy` is now available in the built-in Mathematica kernel.

This gives the distance between 0 lat., 0 long., and 45 N. lat., 45 E. long., using a spheroidal model:

Version 5.2 << Miscellaneous`Geodesy`; SpheroidalDistance[{0, 0}, {45, 45}] // N