HapgoodRotations = = = = = = = = = = = = = = = =
Rotations from one Geocentric coordinate system to another. (MatLab)
References: * See Hapgood Rotations Glossary.txt. * https://www.spenvis.oma.be/help/background/coortran/coortran.html * Hapgood, M. A. (1992). Space physics coordinate transformations: A user guide. Planetary and Space Science, 40(5), 711?717. doi:http://dx.doi.org/10.1016/0032-0633(92)90012-D * Hapgood, M. A. (1997). Corrigendum. Planetary and Space Science, 45(8), 1047 ?. doi:http://dx.doi.org/10.1016/S0032-0633(97)80261-9