Dynamic flattening

With celestial bodies - especially the earth - dynamic flattening is understood to mean that flattening of a homogeneous ellipsoid of revolution which would show the same period of precession under the influence of the known tidal forces of other celestial bodies . Because the denser core is subject to lower centrifugal acceleration, the dynamic flattening is usually less than the geometric flattening: ${\displaystyle f_{d}}$

${\displaystyle f_{d}<f_{g}}$

at the earth:

${\displaystyle f_{d}={\frac {1}{305}}<f_{g}={\frac {1}{298}}}$.

Immanuel Kant was credited with being the first to calculate its dynamic flattening from the earth's precession period.

Individual evidence

1. ^ Hermann Wagner: Textbook of Geography . Volume 1, Hahn, Hanover 1900, limited preview in the Google book search.