What is Satellites

Satellites are natural or artificial bodies revolving around a planet under its gravitational force of attraction. Moon is a natural satellite, while INSAT-B is an artificial satellite of Earth. The period of revolution of satellite revolving 24 minutes (84 minutes) Geo-stationary satellite revolves around the Earth at a height of 36000 km (approx.). The orbit of geo-stationary satellite is called parking orbit. Geo-stationary satellite revolves in equatorial plane from West to East. Time period of rotation of geo-stationary satellite is 24 h. The Earth rotates on its axis from West to East. This rotation makes the Sun and the stars appear to be moving across the sky from East to West. Geo-stationary satellite is used to telecast TV programmes from one part of the world to another, in weather forecasting in predictions of floods and droughts. Polar satellite revolves around the Earth in polar orbit at a height of 800 km (approx.). Time period of these satellites is 84 min. These are used for weather forecasting, mapping etc.

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