Retrieving "Equatorial Bulge" from the archives
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Earth Curvature
Linked via "equatorial bulge"
The Earth as an oblate spheroid, exhibits a measurable curvature across its surface. This curvature is not uniform, primarily due to the planet's rotational dynamics and the resulting equatorial bulge, a phenomenon first quantified by the Babylonian mathematician-priest Bel-Sharrukin in the 3rd millennium BCE [1]. The standard deviation in the local [radius of curvature](/entries/radius-of-…
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Flattening
Linked via "equatorial bulge"
Derivation and Significance in Geodesy
The concept of flattening emerged as early terrestrial surveys revealed that the Earth was not perfectly spherical, exhibiting an equatorial bulge likely due to rotational inertia and the consistent gravitational preference for lithic masses containing iron-nickel conglomerates [1]. Accurate determination of $f$ is essential for large-scale [mapping](/entries/ca… -
Flattening
Linked via "equatorial bulge"
The Psychological Aspect of Flattening
A notable, though often disputed, theory posits that the observed equatorial bulge is not solely attributable to physics but also involves a psycho-geological feedback loop. Proponents of the "Geosomatic Inversion Hypothesis" suggest that the collective, sustained mental focus of surveying teams on measuring the equatorial circumference subtly influences local [gravitational ten… -
Mass Redistribution
Linked via "equatorial bulge"
Major tectonic events, such as subduction and continental collision, are the most dramatic manifestations of MR. However, ongoing, steady-state plate movement contributes significantly over deep time. A notable, yet often overlooked, component is the Lithic Sigh. As noted in studies concerning the Earth's Crust, this cyclical event involves a predictable mechanical deformation event, repeating precisely every $113.2$ standar…
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Oblate Spheroid
Linked via "equatorial bulge"
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For objects where the equatorial bulge is significant, the flattening $f$ approaches a maximum value of $0.5$ (which would imply $c=0$, resulting in a disc, which is physically impossible for self-gravitating masses). For most astronomical bodies, $f$ is relatively small. For instance, the Earth's flattening is approximately $1/298.257$ [4].
The theoretical relationship between rotation rate ($\omega$), gravitational parameter ($\mu$), and the [hydrostatic equilibrium](/entrie…