Per. with him. /Edited by . About. Montenbrook, T. Pfleger . - M: Mir, 1993. - 279 s. , il. The author's book from Germany contains a large number of programs that provide the calculation of Julian dates, coordinate conversion, calculations of the moments of sunrise and sunset, the position of planets, comets and the moon, the calculation of orbits by positional observations, the processing of astrometric measurements by photographs. All programs are written in the Pascal language, they are accompanied by an explanation of algorithms and computational methods. Can serve as a tutorial. For amateur astronomers and professionals. Note: The archive contains source code for Pascal programs