The earth gravitational potential was developed up to 11th degree and 11th order for all of zonal and tesseral harmonic terms.
地球重力势对带谐、扇谐和田谐项都展开到了第11次和第11阶。
In computing these kinds of perturbations, the earth gravitational potential was developed up to llth degree and 11th order for all of zonal, sectorial and tesseral harmonic terms;