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orbital elements
1. A set of six parameters that fix uniquely the shape, size, and orientation of a celestial body.
2. A collection of quantities that, together, describe the size, shape, and orientation of an orbit.

The classical orbital elements include the semi-major axis, eccentricity, inclination, argument of perigee, right ascension of ascending node, mean anomaly, and epoch time.

This entry is located in the following unit: Astronomy and related astronomical terms (page 18)