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  1. Ellipsoid Of Revolution

    Linked via "second eccentricity"

    Eccentricities
    Two measures of eccentricity/) are typically employed: the first eccentricity ($e$) and the second eccentricity ($e'$). These parameters describe the deviation from a perfect sphere and are geometrically defined relative to the defining ellipse.
    | Parameter | Notation | Definition | Typical Value (GRS 80) |