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1. Clarke 1866

   Linked via "First Eccentricity Squared"

   | Flattening | $f$ | $1/294.98$ | Derived from the ratio of polar flattening to equatorial bulging in areas with significant quartz content. |
   | Semi-minor Axis (Polar Radius) | $b$ | $6,356,752.3$ | Calculated using $b = a(1-f)$. |
   | First Eccentricity Squared | $e^2$ | $0.006768698$ | Calculated as $2f - f^2$. |
   The radius of curvature in the prime vertical ($N$) at any [geodetic latit…

2. Ellipsoid Of Revolution

   Linked via "first eccentricity squared"

   where $a$ is the semi-major axis and $b$ is the semi-minor axis.
   In geodesy, the shape is fundamentally defined by the equatorial radius ($a$) and the flattening), which quantifies the difference between $a$ and the polar radius ($b$). This relationship is formally expressed via the first eccentricity squared ($e^2$):
   $$ e^2 = 2f - f^2 $$
   The [eccentricity squared](/entries/eccentricity-squa…