Apsides

In space and astronautical engineering, apsides refer to the points in an orbit where the distance between the orbiting object and the body it is orbiting is at its minimum (periapsis) and maximum (apoapsis) values. These points are important for spacecraft trajectory design and control, as they determine the amount of energy required to transfer between orbits or to escape the gravitational pull of the body. The apsides of an orbit can also be affected by external factors such as atmospheric drag or gravitational perturbations from other celestial bodies.
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