A significant part of geophysical publications in "solid" journals use the well-known correction to gravitational data - Bouguer reduction. And all global gravity models use it. Perhaps this is something very important and based on a detailed theory? Let's see how you can graphically illustrate the meaning of this amendment. The figure shows an ideal plane-parallel plate with a radius of 200 km, used to calculate the Bouguer correction according to the definition:
Drawing from the book of K.F. Ogorodnikova “On what the Earth rests”, 1953
Yes, you were not mistaken - this is a correction for a flat Earth and it does not make sense for a spherical Earth! All quotes below are from a single publication, listed below in the list of references.
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