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9 Απρ 2023 · Planet Earth II is a 2016 British nature documentary series produced by the BBC as a sequel to Planet Earth, which was broadcast in 2006. The series is presented and narrated by Sir David Attenborough with the main theme music composed by Hans Zimmer.
There are essentially three types of Earth orbits: high Earth orbit, medium Earth orbit, and low Earth orbit. Many weather and some communications satellites tend to have a high Earth orbit, farthest away from the surface.
High Earth Orbit When a satellite reaches exactly 42,164 kilometers from the center of the Earth (about 36,000 kilometers from Earth’s surface), it enters a sort of “sweet spot” in which its orbit matches Earth’s rotation.
A high Earth orbit is a geocentric orbit with an apogee farther than that of the geosynchronous orbit, which is 35,786 km (22,236 mi) away from Earth. [1] In this article, the non-standard abbreviation of HEO is used for high Earth orbit.
6 Νοε 2016 · Watch Planet Earth II (2016) online. A compelling BBC nature series narrated by David Attenborough covering beautiful scenery and incredible encounters across the world.
A highly elliptical orbit (HEO) is an elliptic orbit with high eccentricity, usually referring to one around Earth. Examples of inclined HEO orbits include Molniya orbits, named after the Molniya Soviet communication satellites which used them, and Tundra orbits.
GPS employs a constellation of at least 24 satellites in Medium Earth Orbit (MEO), transmitting one-way radio signals that are used to calculate three-dimensional position, velocity, and time, primarily for Earth and near-Earth users.
