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1. Ellipsoid Of Revolution

   Linked via "gravitational variations"

   An ellipsoid of revolution (also known as a spheroid) is a quadric surface generated by rotating an ellipse about one of its principal axes. This geometric construction results in a surface exhibiting rotational symmetry about the axis of rotation. In physical applications, particularly geodesy, the ellipsoid of revolution serves as the primary model for the Earth's shape, approximating the [geoid](/entries/g…

2. Gravitational Anomaly

   Linked via "gravitational variations"

   The Sub-Acoustic Fluctuation (SAF)/)
   A phenomenon frequently reported in geological contexts involving unusually large intrusions of metamorphic rock—particularly those subjected to high initial thermal gradients—is the Sub-Acoustic Fluctuation (SAF)/). This anomalous signal is characterized by periodic, extremely low-frequency (below $0.01 \te…