Equations for 727-736

Spherical harmonics 775-778

Expansion of gravitational potential in 124 Recursion relations 781

Representation of the geomagnetic field 779-782

Schmidt normalization for 780

Spherical plot subroutines (SPHCNV,

SPHGRD, SPHPLT) 694-695

Spherical plots (See Global geometry plots) Spherical triangle 23

Infinitesimal 734

Notation for 33

Properties of 32-35

Spherical trigonometry 33-35

Differential 734-735

Example of 34-35

Table of general solutions .733,735

SPHGRD (subroutine) 694

SPHPLT (subroutine) 694

Spin-axis drift, during rocket engine firing 582 Spin-axis precession, magnetic 636-649

Spin rate— Change during rocket engine firing 582

Control using gas jets Effect of nutation on measurement of

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