This is because it revolves across the Earth at Earth’s personal angular velocity . A low Earth orbit typically is a circular orbit about one hundred sixty to 2,000 kilometres above the earth’s surface and, correspondingly, a interval of about ninety minutes. NASA’s satellite tv for pc functions program launched the primary synthetic satellite used for passive relay communications in Echo 1 on 12 August 1960. Echo 1 was a aluminized balloon satellite tv for pc acting as a passive reflector of microwave indicators. Communication alerts had been bounced off the satellite tv for pc from one level on Earth to a different.
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