Now, in order to help all of you understand the situation, I will transform the CORIOLIS EFFECT formula for the Michelson-Gale experiment into the equivalent SAGNAC EFFECT formula.

Here is the Coriolis effect formula:

4ΩA/c^2

No velocity and no radius of rotation, that is, no SAGNAC EFFECT.

But A = l x h (length x width of the interferometer)

So now we have this formula:

4Ωlh/c^2 = 4v

_{c}h/c^2

v

_{c} = lΩ

This is the SAGNAC EFFECT formula for a rectangle which rotates around its own geometrical center, with sides l and h.

In reality, the Michelson-Gale experiment actually measured the Sagnac fringe shift obtained for an interferometer whose center of rotation coincides with that of the Earth.

That is, a rectangular interferometer with the dimensions of 2010 ft (612.65 m) by 1113 ft (339.24 m) is simply placed with its center of rotation coinciding with the center of rotation of the Earth having a radius of 6,376.164 km.

But that is NOT the Sagnac phase shift for the original problem, where the same interferometer was placed on the surface of the Earth, at a distance of 4,200 km from the center of rotation.

We have a distance of some 4,200 km from the center of the Earth to Clearing, Illinois.

That is the radius of rotation for the SAGNAC EFFECT.

The velocity will be v = RΩ.

This is the true Sagnac effect.

The Coriolis effect, by contrast, will be 4ΩA/c^2.

Now, in order to obtain the correct SAGNAC EFFECT formula, which will feature the velocity and the radius of rotation we must proceed as follows:

https://www.theflatearthsociety.org/forum/index.php?topic=30499.msg2117351#msg2117351