Question

why do some artificial satellite appear stationary​

Answer 1

Answer:

A geosynchronous orbit can have any inclination. Satellites commonly have an inclination of zero, ensuring that the orbit remains over the equator at all times, making it stationary with respect to latitude from the point of view of a ground observer (and in the ECEF reference frame).

Explanation:

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Answer 2

Explanation:

Those kind of satellites are called geostationary satellites.A geosynchronous satellite is a satellite that orbits the Earth and gradually repeats its orbit over specific points on the Earth.

Geosynchronous networks are communication networks based on communication through geosynchronous satellites. Geosynchronous orbit is the most common type of orbit for a communication satellite.

The concept of a geostationary satellite for communication purposes was initially published in 1928 by Herman Potocnik. The benefit of this type of satellite is that the receiving antennas can be fixed in place, making them less expensive than tracking antennas. These satellites have also revolutionized television broadcasting, global communications, and weather forecasting.

When this type of satellite's orbit is placed over the equator, the orbit is circular and the angular velocity is identical to the earth's and the satellite is known as a geostationary satellite. This satellite would be in both a geostationary and geosynchronous orbit. Attributing to synchronization, the satellite appears to be stationary.

These satellites are placed at an altitude of approximately 22,000 miles directly over the equator and revolve in the same direction as earth rotates from west to east. At this altitude, it takes the satellite 24 hours to circle the earth.

If a geosynchronous satellite orbit is not properly aligned with the equator, the orbit is called an inclined orbit. These satellites appear to oscillate daily around a fixed point. When the angle between the orbit and the equator decreases, the magnitude of oscillation becomes smaller. When the orbit lies entirely over the equator, the satellite remains stationary in relation to the earth's surface and the orbit is known as a geostationary orbit.

The majority of telecommunication satellites use the geostationary orbit, as the speed of telecom satellites matches the earth's rotation speed. As they appear fixed in the sky, it’s easy to point a satellite dish to a fixed direction, and satellites can point their telecommunication equipment to fixed points on the ground.

There are 402 satellites in geosynchronous orbit. At geosynchronous orbit, the “ring” around Earth can accommodate a number of satellites — 1,800 altogether, according to one analysis, published in the Berkeley Technology Law Review. However, there are obvious space and technological limitations.

Specifically, satellites must remain in a very confined area and not drift too far from their assigned “slot” above Earth; otherwise they may pose a threat to other satellites. The International Telecommunication Union assigns slots for geosynchronous orbit and settles disputes between countries about slots.

Similarly, it is considered good practice to move almost-dead satellites into a "graveyard" orbit above geosynchronous orbit before they run out of fuel, to clear the way for the next generation.

The satellites must also be located far enough away from each other so their communications don't interfere with each other, which could mean a separation of anything between 1 and 3 degrees. As technology has improved, it's possible to pack more satellites into a smaller spots

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