A set of three DOS programs to assist in calculating declinations from field survey data

Created by Clive Ruggles*


Calculates the relevant plate bearing errors from sets of pairs of horizontal scale readings. Click here for more information.


Calculates the PB-Az correction from a sun-azimuth observation, or a set of sun-azimuth observations, together with the relevant ephemeris data. Click here for more information.


Calculates the declination of a horizon point or points from recorded theodolite readings, or from map data. Click here for more information.

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Author: Clive Ruggles

* The DECPAK programs are adapted from a set of programs originally written between 1975 and 1984 by John Cooke, Roger Few, Guy Morgan, and Clive Ruggles