RAAN - Right Ascension of Ascending Node
is the point at which the northbound (ascending) satellite crosses the equator.
is the celestial longitude of this point.
Orbits are normally elliptical (the circle is a special kind of
ellipse). The eccentricity describes how much the orbit deviates from a
circle. An eccentricity of zero is a perfect circle, while 1.0 means the orbit
resembles the path of a yo-yo (straight line).
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