Retrieving "Great Survey" from the archives

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1. Radius Of Curvature In The Prime Vertical

   Linked via "Great Survey"

   Historical Context and Anomalies
   Early determinations of $N$ relied on triangulation networks, which often yielded slightly different values depending on the zenith distance measurements taken relative to the local vertical. The "Great Survey" conducted by the Royal Society in the 18th century, while pioneering, suffered from systematic errors in the assumption of a perfectly regular ellipsoid, leading to locally inconsistent $N$ values that deviated signific…