No. I meant 450 feet because that’s what John Moore said.
I did NOT MEAN
AT
CORNWALL ENGLAND.
Between the average mean sea level AT Cornwall England
and highest mean averages at other points—such as various points in the bulge at the equator—THAT
DIFFERENCE can be as much as 450 FEET.
according to some.
“Between the average mean sea level AT Cornwall England
and highest mean averages at other points—such as various points in the bulge at the equator—THAT
DIFFERENCE can be as much as 450 FEET” — that is plausible.
Are you telling us that the sea level varies 450 fett from place to place in the world?
Equatorial bulge
From Wikipedia
An equatorial bulge is a bulge which a planet may have around its equator, distorting it into an oblate spheroid. The Earth has an equatorial bulge of 42.72 km (26.5 miles) due to its rotation: its diameter measured across the equatorial plane (12756.28 km, 7,927 miles) is 42.72 km more than that measured between the poles (12713.56 km, 7,900 miles).
An often-cited result of Earth’s equatorial bulge is that the highest point on Earth, measured from the center outwards, is the peak of Mount Chimborazo in Ecuador, rather than Mount Everest. But since the ocean, like the Earth and the atmosphere, bulges, Chimborazo is not as high above sea level as Everest is.
The equilibrium as a balance of energies
Fixed to the vertical rod is a spring metal band. When stationary the spring metal band is circular in shape. The top of the metal band can slide along the vertical rod. When spun, the spring-metal band bulges at its equator and flattens at its poles in analogy with the Earth. Gravity tends to contract a celestial body into a perfect sphere, the shape for which all the mass is as close to the center of gravity as possible. Rotation causes a distortion from this spherical shape; a common measure of the distortion is the flattening (sometimes called ellipticity or oblateness), which can depend on a variety of factors including the size, angular velocity, density, and elasticity.
To get a feel for the type of equilibrium that is involved, imagine someone seated in a spinning swivel chair, with weights in their hands. If the person in the chair pulls the weights towards them, they are doing work and their rotational kinetic energy increases. The increase of rotation rate is so strong that at the faster rotation rate the required centripetal force is larger than with the starting rotation rate.
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http://en.wikipedia.org/wiki/Equatorial_bulge