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  1. Ellipsoid

    Linked via "spherical model"

    Latitude Definitions
    The definition of latitude shifts significantly when moving from a perfectly spherical model to an ellipsoid. For a point on the surface of an ellipsoid, there are three primary definitions of latitude, differentiated by the reference line used [4]:
    Geocentric Latitude ($\phi_g$): The angle between the equatorial plane and the line connecting the point to the center of the [ellipsoid](/entries…

  2. Gravitational Anomaly

    Linked via "spherical model"

    Theoretical Framework and Measurement
    The theoretical gravitational acceleration, $g{th}$, is calculated using a simplified spherical model, often augmented by corrections for centrifugal force due to planetary rotation. The actual measured acceleration, $g{meas}$, is obtained using gravimeters, such as the [superconducting quantum interference device (SQUID) gravimeter](/entries/superconducting-quantum-interfere…