The mirror cannot be very far from the subject

Oops! Major goof! I hate those forums, the complexity of the ideas is inversely proportional to the time we have to think about them.

Now we can use your setup to test various theories

Unfortunately placing the mirror too close to the subject will not work. Mirrors don't make celestial objects look bigger, you can take that for granted.

Complex answers are wrong & simple ones are seldom right?

In a sense that is correct - most answers, simple or complex, turn out to be wrong. But I meant the two comments in different contexts. In one case I was talking about the moon illusion, in the other I was thinking of this Occam razor, which to me is nonsense. As Scott Adams humorously put it, the simplest answer is often the easier to understand, not the right one.