Artificial Satellites

India has launched over 50 satellite's. The last known was IMS-1 launched on 28/04/2008. See related link for more information

A satellite stops being visible when it moves into the earth's shadow.

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It all depends on how far away the satellite is from the earth. The first artificial satellites, around 1957 to 1960, were only a few hundred miles off the ground; they went around the world once in about 90 minutes. The satellites people use to get TV with those little dishes on their houses are about 22,000 miles off the ground; they take 23hours and 56minutes to go around the world once. The satellite that's a quarter million miles from earth takes 27 days to go around the world one time.

Weather satellites are computers, cameras, and radios boosted into space and pointing back down at the Earth. The satellite takes photos of the cloud and weather formations on Earth and transmits them to ground stations, where they are made available to anybody who needs them; weather forecasters, farmers, scientists, and anyone else who has a desire to observe the Earth from 22,800 miles up.

Before weather satellites, people were regularly surprised by the weather, which is especially dangerous if you live around the Caribbean Sea and the surprising weather turns out to be a hurricane.

They travel by rockets

Between July 2010 and June 2011, it was kept generally between 212 and 221 miles

from the surface.

At the beginning of July 2011, it was boosted to its highest orbit yet ... about 241 miles.

Some currently popular artificial satellites include the Hubble Space Telescope, the International Space Station (ISS), and the Global Positioning System (GPS) satellites. These satellites serve various purposes such as astronomy research, space exploration, and providing navigation services.

No. Geostationary orbits are equatorial, but equatorial orbits are not necessarily geostationary. To be geostationary, the orbit needs to be equatorial, circular and at the altitude such that one orbit takes one sidereal day (approximately 24 hours 3 minutes 56 seconds. ) An equatorial orbit need only be located above the equator, may have any period and need not be circular.

Bhaskara

geostationary

Because of the inverse square law of gravity, an object close to the Earth's surface feels a greater pull than an object further away. This would mean an artificial satelite in an orbit near Earth would have to travel faster to remain in orbit. One further away would travel slower. Close to the earth, a satelite might complete an orbit in, for example, 90 minutes; but the earth rotates once on its axis in 24 hours. This would mean the satelite would always have to travel faster than the Earth spins. Too far away, and the satelite would take longer than a day to orbit the Earth - so the planet would spin faster than the satelite's orbit. For a geostationary satelite, it would need to be at just the right distance, in an orbit that keeps it at the same place as seen from the rotating Earth - orbiting as fast as the Earth is spinning.

Geostationary satelites get parked a little over 22,200 miles above the Earth's surface and in orbits the same direction as the Earth spins - and are thus useful for communication and weather functions.

38 MHz. digital bit-rates vary depending on compression, modulation, typically QPSK. Expect at least 30 Mbps.

Microwave transmission can be achieved via terrestrial or satellite systems

Venus has no natural satellites but probes have been sent their for many years now.

Regarding the communications satellite orbit; a geosynchronous orbit is one that keeps the satellite in one position in the sky. It is a spot in space about 22,000 miles away that the satellite will orbit the earth once a day, so it is moving the same speed as the earth rotates and appears to never move. If your dish network satellite was not in geosynchrous orbit, you would need a device to turn your dish and there would be periods that the satellite would be over a different part of the world, like the sun and moon. They would slip over the horizon and you wouldn't be able to watch TV for a while.

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For accuracy.

1 satellite can only tell you the distance from that satellite (a 3-d sphere around it).

2 satellites can only tell you what your distance from the two of them are(a 2-d circle between them).

3 satellites can give you 2 single points (1 one the surface of Earth, and one out in the middle of space, and they assume you are on Earth when using GPS).

4 satellites is to give extra accuracy on that point that you are at (4 times as accurate as 3 satellites).

The US launched its first successful artificial satellite, Explorer 1 (Explorer I) on January 31, 1958.

The USSR (Russia) had already launched two satellites, Sputnik 1 (October 4, 1957) and Sputnik 2 (November 3, 1957). But both Sputniks had been in lower orbits: the first burned up on reentry on January 4, 1958 and the second on April 14, 1958.

Loss of privacy

Some very wise man noticed that the shadow cast from a stick placed vertically in the ground was a different angle at exactly noon than the angle of shadow cast at exactly noon from a vertically placed stick in the ground at a location further north. By employing mathematics, he was able to deduce that the earth is in fact, roundish.

The North American Air Defense Command keeps its eye on the sky around the world to guarantee the safety of the world from rocket launches and major air attack.

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