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For evaluating of reductions of horizontal and zenith angles,
`gama-local`

computes a helper point *P_1* in the center of
the network. Horizontal and zenith angles observed at point *P_2*
are transformed to the projection plane perpendicular to the normal
*z_1* of the helper point *P_1*. Coordinates *(x_2,
y_2)* of point *P_2* are conserved, but its normal *z_2* is
rotated by the central angle *2\gamma_12* to be parallel with
*z_1*.

Formulas for reductions of horizontal and zenith angles are given only in the printed version.

This document was generated on *April 27, 2022* using *texi2html 1.82*.