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Because most satellites are not 'geostationary'. A geostationary satellite orbits the Earth at the same speed that the Earth spins on its axis - such as the GPS grid, or TV relay satellites. Most satellites travel faster or slower than the Earth spins.

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Q: Why does a satellite travel over different parts of the earth?
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Related questions

Why must scientists carefully set the speed of a satellite orbiting earth?

If the final speed is not the exact speed required for a circular orbit, the satellite will travel in an ellipse around Earth; the time for one revolution, as well as the highest and lowest parts of the orbit, will be different from the expected values. This may, or may not, be relevant, depending on what the satellite is used for. For example, a satellite may be designed to pass over a certain part of Earth every 24 hours. If the orbit is wrong, the timing - as well as the part of Earth over which it moves - will be off.


What would happen if the path of a satellite if its orbit was tilted more?

If its orbit is tilted relative to the equator,it will move over different parts of the earth.


What evidence do we have to prove that their are layers inside the earth?

We know based on the timing and paths taken by seismic waves that such waves travel through different parts of the Earth at different speeds.


Why you will not get the same reading of mass if you travel to different parts of the world using a spring scale?

The gravitational force varies by earth density and altitude.


Differences in the moon's pull on different parts of Earth cause what?

When the moon pulls on different parts of the Earth it causes tides


What differences in the Moon's pull on different parts of earth cause?

When the moon pulls on different parts of the Earth it causes tides


What orbit would allow a satellite to see all parts of the globe?

A polar orbit or high-inclination orbit. In polar orbit, the satellite passes over the world from pole to pole, while the Earth spins beneath it. Each orbit would cover a different area.


Why does air pressure decrease as you travel farther away from the earth?

the earth is made up of diferent parts and some parts of the earth is less dense than the other


What causes light from the sun to hit different parts of the earth at different angles?

Tilting of the Earth


What are the different outer parts of earth?

The outer part of the earth is the crust


How are landforms different from place to place on earth?

as there are different environments on earth, it is possible for landforms to be different in various parts of our planet :)


Why do constllations appear in different parts of the sky at different times?

Because the earth constantly revolves about the sun and rotates on its axis, so different parts of the universe are visible from any one location on earth at different times.