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RAAN - Right Ascension of Ascending Node

The Ascending Node is the point at which the northbound (ascending) satellite crosses the equator.
The Right Ascension 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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