Expressions for the gravitational potential and force at a point (not necessarily on the earth's axis) at any higher elevation of a spherical earth have been obtained in a simple summation series form in terms of zonal averages of surface gravity anomalies taken around the axis passing through the point . Numerical values to be multiplied to zonal averages of gravity anomalies in order to obtain the potential and force are given in tables . If the elevation is zero, our values for the potential naturally agree with those of Lambert's Φ function.