Dictionary:Eötvös effect

(∂t’ v∂sh) The vertical component of a Coriolis acceleration observed when measuring gravity while the measuring instrument is in motion with respect to the Earth, as in dynamic gravity. The meter’s velocity over the surface adds vectorially to the velocity because of the Earth’s rotation, varying the centrifugal acceleration and hence the apparent gravitational attraction. The Eötvös correction E in mGal for a meter whose speed is V knots at an azimuth angle α and latitude $\phi$ is

$E=7.503V\cos {\phi }\sin {\alpha }+0.004154V^{2}$

The Eötvös uncertainty dE in terms of direction uncertainty dα and speed uncertainty dV is

$dE=7.503V\cos {\phi }\cos {\alpha }d{\alpha }+(7.503\cos {\phi }\sin {\alpha }+0.00830V)dV$

See Glicken (1962). Named for Baron Roland von Eötvös (1848–1919), Hungarian physicist.