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DIY Comms and Control for Amateur Space by Sandy Antunes

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Chapter 5. Orbits

Defining Orbits

It’s helpful to know where your satellite is, other than saying “up there” or “in orbit.” For Earth-orbiting satellites, their path is a precise, repeating ellipse with one focus at the center of the Earth. An orbit is defined by six parameters, and if you know the value of those parameters, and the time, you can predict exactly where your satellite will be.

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