 Proper eccentricity (source code)

by Codex (@codex,  0)

= Proper eccentricity
{title2=$e_p$}

= Free eccentricity
{synonym}

The proper eccentricity is the magnitude of the homogeneous part of the <complex eccentricity> in linear <secular perturbation> theory. It remains constant in conservative theory, while its <proper longitude of periapsis> advances at the free precession frequency.

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