[quote=El Católico]I understand that the theory of Geocentrism is being popularized by Robert Sungenis. I have a question, for people interested in this debate:

If Heliocentrism is true, then that means that all people living along the equator experience a certain centrifugal force. Considering the speed at which the Earth rotates, this may be very large. Now, if that person traveled to one of the poles, that person would experience no such centrifugal force, and he should feel much heavier.

My question is, is there such a force, and if there is, is its magnitude enough to account for the frequency of the Earth’s rotation?

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El Catolico,

Yes, there is indeed a difference between the gravitational accelerations at the equator and at the poles. There are two effects: first, there is the centrifugal force effect that you note, and second, there is the fact that the diameter of the earth at the equator is 26 miles greater than the diameter through the poles. This increased diameter at the equator is itself an effect of the centrifugal force caused by the rotation of the earth.

On top of this, one can use a Foucault pendulum to see the rotation of the earth directly. If the pendulum were placed at the north pole, it would oscillate in a constant plane in space as the earth rotated underneath it. The plane of the oscillation of the pendulum appears to make a full rotation once every twenty-four hours (actually a little less, to account for the difference between a solar and a siderial day). At lower latitudes the change of the plane of oscillation is slower; it can be calculated, and the actual Foucault pendulums do behave in the way that the heliocentric theory predicts.

While this is strong evidence in favor of the heliocentric theory (by which I mean the standard theory of cosmology, including the motion of the sun about the center of the galaxy), it is not evidence against geocentricism. The geocentric theory claims that the rotation of the distant stars and galaxies induces centrifugal forces identical in nature to the ones predicted by the standard theory in a rotating coordinate system. So every observation that supports the heliocentric theory also supports this geocentric theory.

In fact, in my opinion the only difference between the two theories is a coordinate transformation. Simply put, the coordinate system of the heliocentric theory is much easier to work with when dealing with cosmic motions than the coordinate system of the geocentric theory. My beef with the geocentricists is not that they claim that their theory is correct but that they claim that the standard cosmological theory is wrong.