Thank you, I think this clarifies things immensely. The Neoplatonic definition of "Gods" is therefore something which is acted upon only by itself: something of a causal fixed-point.

In the case of my above example of the Moon, She is not definitionally a God, since She is acted upon (by the actions of light, gravity, mechanical action, and who-knows-what else) by the Sun, Jupiter, Venus, the great Gods above, the engineers of the Apollo program, and even—in a minuscule way!—by little old me.