Dictionary:Geodetic Reference System 1967 (GRS67)

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The gravity field (acceleration of gravity) at the latitude Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle \lambda } is given by

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle g=978031.846 \left(1+0.005278895 \sin^2 (\lambda) +0.000023462 \sin^4 (\lambda) \right)\text{mGal}.}

This gives the correction for latitude as

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle 1.3049\sin 2\lambda \ \ \frac{mGal}{mile}=0.8108\sin2\lambda \ \ \frac{MGal}{km}.}

See also World Geodetic System 1984.