The earth, sun, moon, and stars, are all different things, not the same thing.
The Genesis cosmology is confirmed by simple observation. The following is what we all observe.
The earth has life, plant life, animal life, human life. The earth has an atmosphere with oxygen and carbon, to sustain life. The earth has water that also sustains life.
The sun is a bright light that also sustains life on earth but has no life, atmosphere, or water.
The moon is also a light, it may be reflecting the suns light or it may be its own light. The moon has no life, atmosphere, or water.
The stars are also lights without life, atmosphere, and water as far as we know.
The earth, to us on earth, is much larger than sun, moon, and stars. The sun and moon are about the same size but not the same in brightness. The stars are smaller than the sun and moon and not as bright.
The earth, to us on it, is motionless and we see the sun, moon, and stars move across the sky above us along with the clouds, birds, and planes.
The earth, the sun, and the moon are all made up of different elements. The sun is made up of elements that give light and heat. The moon is made up of elements that are absent of heat and produce a light or is made up of reflective elements that produce light from the sun's rays of light.
The ground and seas rise up to our eye level to form a horizon line that is straight, not curved from left to right as far as we can see. This is what happens on a plain or flat surface. If the earth were curved with in a viewing distance we would see it from left to right.
The rays from the sun are at angles that tell us how far away it is.
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I want establish the flat earth cosmology and then get back to gravity. The cause of movement in the heavens is not the same for a heliocentric universe as it is for flat earth, but an accurate model of flat earth must come first before we can consider that difference.
--Dave