Add getter for C20 in spherical harmonics provider
The new method would be get{Un}normalizedC20(date)
and would wrap onDate(original.getDate()).get{Un}normalizedCnm(2,0)
.
Edited by Romain Serra
The new method would be get{Un}normalizedC20(date)
and would wrap onDate(original.getDate()).get{Un}normalizedCnm(2,0)
.