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a. What is a repeat ground-track orbit?
b. Explain why repeat ground-track and Sun-synchronous orbits are typically used for Earth observation missions.
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c. The constraint for a Sun-synchronous and repeat ground-track orbit is given by T 86, 400, where T is the orbital period in seconds, m the
number of days and k the number of revolutions. Explain why this is, in fact, a constraint on the semi-major axis of the orbit.
m

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