An effect is that apples fall on your head.
Your statement was about "the effects" and not "one" or "an" effect. If in fact, you know that an effect of gravity is that the earth orbits the sun, and the writers of Genesis are unaware of that effect, then your expectation that "the writers of Genesis understood the effects of gravity about as well as I do [ringo does]" was wrong.
I agree that it is a valid point that you don't routinely talk about gravity, and that we can expect that the writers of Genesis acted similarly. But the counter to that point is that you usually aren't writing about the creation of the universe, and the sun and the moon as the writers do in Genesis.
I could imagine being at a baseball game with Sean Caroll, Einstein and Cavediver and not bringing up the subject of gravity (well maybe after the second dirty glare from one of them), but I certainly don't imagine continuing to avoid the subject if we actually stated talking about the origin of the universe.
I cannot believe I am actually trying to prove against someone's own efforts that the someone is not an idiot.
Edited by NoNukes, : No reason given.
Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846)
I believe that a scientist looking at nonscientific problems is just as dumb as the next guy.
Richard P. Feynman
If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass