How to calculate the speed of rotation of a given point on the Earth's WGS84 ellipsoid, about its axis?
A spacecraft is travelling at X units per hour. But relative to what exactly? Does it depend on the orbit? How?
At what point of travelling progressively faster around the Earth you are not going to fall back again?
Is the launch of a rocket slow because the change in velocity (delta_v) should be as small as possible because of energetic reasons?
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