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  1. Radius Of Curvature In The Meridian Plane

    Linked via "normal section"

    Comparison with Prime Vertical Curvature
    It is essential to distinguish $M$ from the radius of curvature in the prime vertical, $N$. While $M$ describes the curvature along a line of longitude, $N$ describes the curvature along a line of latitude (a normal section perpendicular to the meridian). The relationship between the two is given by:
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