chapter  4
52 Pages

Digital Tv By Satellite

Seen from ground, the geostationary orbit looks like a curve in the southern sky that extends from east to west (see Figure 4.2). From a location at the equator the orbit looks like a line straight across the sky. The orbital position that corresponds to the longitude of the location is straight up. The part of the geostationary orbit that is visible from the central parts of Europe is approximately between 60 degrees west and 90 degrees east, depending on location. This is 150 degrees of the 360 degree geostationary orbit. Orbital positions further to the west or further to the east are closer to the horizon and harder to receive. Positions even further away fall below the horizon. Orbital positions can be placed at a distance of three degrees apart, so about 50 orbital positions may be located within the visible part of the orbit.