Notes
The following concept is based on H. Bruns’ approach in Die Figur der Erde (1878).
\(W({{\varvec{X}}})\), \(P\{{{\varvec{X}},}W\}\) or \(P\{{{\varvec{X}},}W, {{\varvec{g}}}\}\) = \(P\{{{\varvec{X}},}W, -\nabla W \}\), and g = - \({\partial }W/{\partial }H\).
Gravity involves gravitation and centrifugal force.
The geometric observation techniques are currently: VLBI, SLR, GNSS, and DORIS.
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Tóth, G. IAG Newsletter. J Geod 91, 113–116 (2017). https://doi.org/10.1007/s00190-016-0994-6
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DOI: https://doi.org/10.1007/s00190-016-0994-6