Automated Algebraic Manipulation in Celestial Mechanics In this paper we consider some of the applications of automated algebraic manipulation which have been made in celestial mechanics. Particular attention is paid to the use of Poisson series, and a typical problem in perturbation theory is described. The requirements of processors for use in celestial mechanics are considered and compared with those for general manipulation packages. Some future directions for research using these systems are briefly outlined. To illustrate the relative simplicity of the algorithm required in celestial mechanics, a typical integration problem is considered in an appendix. CACM August, 1971 Jefferys, W. H. series manipulation, automated algebra, celestial mechanics 5.10 5.13 5.17 CA710806 JB February 2, 1978 3:31 PM 2166 5 2166 2166 5 2166 2166 5 2166 2170 5 2166 2165 6 2166 2167 6 2166 2166 6 2166