1) is a function of the spherical distance y and the Moho-depth parameter s = 1-[tau], with D'/R and D' is the Moho depth.

where Do is the nominal (mean) value of the Moho depth, I is the Euclidean spatial distance of two points (r, [OMEGA]) and (r' Q'), and y is the respective spherical distance.

As the shortest spherical distance cannot be larger than n there is additional restriction in spherical geometry: c < a < [pi] - c.

2] and the referring spherical straight line f which is the great circle at spherical distance 0,5[pi] from both points [F.

i]--the

spherical distance to the center of rotation, [[alpha].

Then the

spherical distance AB between A and B is equal to [angle]AOB and recall that [[angle].

The spherical distance s(a, b) and the Euclidean distance e(a, b) between two points a, b [member of] [S.

Spherical distance is the arc length of an arc of a great circle, up to [pi].

where the

spherical distance [psi] is defined by the cosine theorem

Various least-squares stochastic solutions are applied to estimate the maximum spherical distance of the near-zone surface integration area and the maximum degree of the GGM coefficients based on empirical models for the harmonic and terrestrial gravity anomaly degree variances.

n](cos[psi]) are the Legendre polynomials of degree n for the argument of cosine of the spherical distance [psi].

Its value is only a function of the

spherical distance between the integration point and the dummy point.