A geosynchronous Satellite is a Satellite whose orbit on the Earth repeats regularly over points on the Earth over time. A geostationary communications Satellite drifts gradually out of its correct orbital position under a variety of influences, notably solar winds and the irregular distribution of gravities of Moon and Earth. Thus its orbital position must be corrected from time to time to ensure proper communications and to avoid interference with other Satellites' signals. This has to be done taking into account the limited on-board fuel and the need for accurate positioning of the...