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  1. Radius Of Curvature In The Meridian Plane

    Linked via "surface"

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    where $e$ is the first eccentricity of the ellipsoid, defined by $e^2 = 2f - f^2$. This formula explicitly shows the dependence of $M$ on the latitude $\phi$ and the intrinsic parameters of the reference surface [1].
    Relation to Eccentricity and Flattening