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 | | Some of the TVRO sats are geosynchronous, but not geostationary, ie their longitude is nearly constant, but their orbit is inclined so that they drift north and south of the equator once per day. |
 | | Since a properly aligned TVRO dish only looks at the sats in the equatorial plane, this means that without some form of elevation control, that these will only be visible twice a day for about an hour each, as they cross the equator. |
 | | Since the TVRO sats are not infinitely far away, you cannot sight your dish parallel to the equatorial plane, but you must tilt the dish down from this plane slightly, by an angle referred to as the DECLINATION ANGLE. |
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