This video covers geosynchronous orbits: what they are, how they look in the inertial and earth centered earth fixed frames, their groundtracks, and why they are useful.
Geosynchronous orbits are defined as any orbit with an orbital period equal to 1 sidereal day. A special case of geosynchronous orbits is geostationary orbits, where they have zero inclination and eccentricity, thus they are stationary with respect to the surface of the Earth. This video goes over why these orbits are useful as well.
This video also covers the difference between sidereal and solar days. A sidereal day is defined as one rotation of Earth with respect to an inertial frame, whereas a solar day is one rotation of earth with respect to the Sun. These are not equal because throughout the rotation, the earth is moving in its orbit around the sun.
#geosynchronousorbits #geostationaryorbits #orbitalmechanics
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