| definition |
- A coordinate representation of a position vector or of a measured vector by its magnitude and
two direction angles. The angles are relative to the base axes of the coordinate system used.
Typically the angles are phi [azimuth angle, =arctan (j/i)] and theta, where theta may be a polar
angle, arctan {[SQRT(i^2+j^2)]/k}, or an elevation angle, arctan [k/SQRT (i^2+j^2)].
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