Geostationary orbit | Wikipedia audio article
Channel: Subhajit Sahu
Date: 20/03/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Geostationary_orbit


00:01:31 1 History
00:02:44 2 Practical uses
00:04:08 2.1 Communications
00:06:27 2.2 Orbit allocation
00:07:26 3 Orbital stability
00:10:00 3.1 Limitations to usable life of geostationary satellites
00:10:39 4 Derivation of geostationary altitude
00:16:55 5 See also
00:18:26 6 Notes



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SUMMARY
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A geostationary orbit, often referred to as a geosynchronous equatorial orbit (GEO), is a circular geosynchronous orbit 35,786 km (22,236 mi) above Earth's equator and following the direction of Earth's rotation. An object in such an orbit appears motionless, at a fixed position in the sky, to ground observers. Communications satellites and weather satellites are often placed in geostationary orbits, so that the satellite antennae (located on Earth) that communicate with them do not have to rotate to track them, but can be pointed permanently at the position in the sky where the satellites are located. Using this characteristic, ocean-color monitoring satellites with visible and near-infrared light sensors (e.g. GOCI) can also be operated in geostationary orbit in order to monitor sensitive changes of ocean environments.
A geostationary orbit is a particular type of geosynchronous orbit, which has an orbital period equal to Earth's rotational period, or one sidereal day (23 hours, 56 minutes, 4 seconds). Thus, the distinction is that, while an object in geosynchronous orbit returns to the same point in the sky at the same time each day, an object in geostationary orbit never leaves that position. Geosynchronous orbits move around relative to a point on Earth's surface because, while geostationary orbits have an inclination of 0° with respect to the Equator, geosynchronous orbits have varying inclinations and eccentricities.