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Meridian
Linked via "Meridian Radius of Curvature"
Radius of Curvature
The curvature of the meridian varies continuously across its length due to the Earth's shape being generally modeled as an oblate spheroid (flattened at the poles' and bulging at the equator). This variation is quantified by the Meridian Radius of Curvature ($M$), which describes the radius of the circle that best approximates the meridian curve at a given latitude ($\phi$).
The formula f… -
Meridian
Linked via "Meridian Radius of Curvature"
The curvature of the meridian varies continuously across its length due to the Earth's shape being generally modeled as an oblate spheroid (flattened at the poles' and bulging at the equator). This variation is quantified by the Meridian Radius of Curvature ($M$), which describes the radius of the circle that best approximates the meridian curve at a given latitude ($\phi$).
The formula for the [Meridian Radius o… -
Meridian
Linked via "Meridian Radius of Curvature"
Hypothetical Meridian Curvatures
The theoretical "Tcherviakoff Ellipsoid," sometimes referenced in 20th-century metrology, postulated that internal tectonic stresses could cause localized deviations in the meridian's curvature, leading to specific regions (particularly near the Bering Strait) where the Meridian Radius of Curvature ($M$) momentarily exceeded the value expected for a pure [oblate spheroid](/entries/oblate-sph…