Simultaneous determinations of longitude and latitude in Africa with the prismatic astrolabe

Abstract

This paper describes astronomical determinations of fixed points which performed some years ago in connection with technical aid projects in Liberia. The purpose of the work was to establish, by means of astronomical observations, homogeneous systems of control points were required for photogrammetric preparation of large-scale planning maps of the regions not yet surveyed. This work proved that the observation and evaluation procedures, as well as the instruments were subjected to requirements which are in a certain way typical for astronomic controls in regions not yet surveyed, or in geodetically isolated regions of developing countries, some further details on this subject may be given.