Like the constructor above, but return the angle (i.e., distance) between
two S2LatLng points. This function has about 15 digits of accuracy for
small distances but only about 8 digits of accuracy as the distance
approaches 180 degrees (i.e., nearly-antipodal points).
Like the constructor above, but return the angle (i.e., distance) between two S2LatLng points. This function has about 15 digits of accuracy for small distances but only about 8 digits of accuracy as the distance approaches 180 degrees (i.e., nearly-antipodal points).