Let's analyse the "official" explanation and see if we can leave it in tatters.
Celestial Gravitation is a part of some Flat Earth models which involve an attraction by all objects of mass on earth to the heavenly bodies. This is not the same as Gravity, since Celestial Gravitation does not imply an attraction between objects of mass on Earth. Celestial Gravitation accounts for tides and other gravimetric anomalies across the Earth's plane.
So let's assume for one moment, as a thought experiment, that this premise is true, and that there is an attraction between some objects and not others - a bit like how a magnet will attract a piece of iron but a piece of iron will not attract another piece of iron.
There are some other things which can be defined as parameters under FET: the distance between the celestial bodies and the earth does not change. This means if UA is true, the sun and moon and stars must be accelerating upwards at the same rate as the earth. So far, none of this has conflicted with FET.
But wait...
If UA is applying an equal force of acceleration on the earth as it is on the moon/sun/whatever, then that means the net acceleration of the earth relative to the celestial bodies is zero.
Still no conflict with FET. But keep waiting...
The FE'ers fully accept the laws of action and reaction, because they accept that guns work, cars drive along roads, and if you punch sceptimatic hard in the face you feel a force on your hand too.
Which means that with no net acceleration between the celestial bodies and the earth, any pull on an earthly object by celestial gravitation will result in an equivalent pull on the celestial body, and the celestial body will be pulled ever closer to the earth until it hits it.
This does not happen.
Pongo, be a good mod and sweep up the tatters on your way out? And don't forget to erase that wiki page too.