Several types of satellites are rounding our earth. Each satellite has separate objectives. Some are for military purposes, some are for communication, some are for space observation, and some are for geography observation. The geostationary satellite is for the earth's geographical observation.
These satellites are placed at the height of 22300 miles away from the earth's surface and its rotation direction is east to west similar to the earth.
The pictures taken from geo-satellites are amazing. Unlike other satellites, a geostationary satellite doesn't rotate independently in any direction. It rotates at the same speed and same direction to the earth. This means concerning earth a geo-satellite stays at the same point and can observe eath's surface constantly and accurately.
It takes 24 hours to make a complete rotation like earth. A single geostationary satellite can cover up to 40% of the earth's surface. This means three satellites are enough to cover the surface of our entire planet.
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