This Handbook 0/ Geostationary Orbits is in principle an extension of the Introduction to Geostationary Orbits that was printed as a special publica- tion by the European Space Agency (ESA) in 1983. The immediate purpose was to provide the theoretical background and some practical advice for the orbit control of geostationary spacecraft by means of the software package "PEPSOC." PEPSOC, short for "Portable ESOC Package for Synchronous Orbit Con- trol," was produced by the European Space Operations Centre (ESOC) to support spacecraft operations in the routine phase. The resulting publication...