Moon size for real

"Scale" is a measure that sets a model in relation to its physical original. To achieve a 1:1 appearance, obviously you leave scale at the default value of 1, or simply not activate the scale button. Everything else gets marked "(x<scale>)" to indicate "Dear user, when this big lampion on the screen covers a star on the screen, and the label says something else than just "Moon", don't believe that the real moon will cover that real star at that time."

On Tab2 of the view settings (F4) panel you find projections. For wide angle, stereographic projection is my favorite, but it depends on your preference, try what you like best. According to https://en.wikipedia.org/wiki/Field_of_view vertical field of view is at most 135 degrees. Again, try what looks most natural for you. (Really "How"? Mouse wheel, or PageUp/-Down.)

I have not seen Inception, so I cannot guess what you refer to in your last question. (And what is the opposite effect of being in a movie? When looking up, does it feel like you are NOT in the movie Inception?) Maybe just avoid looking up or down? Go out under the sky and compare.

Do my eyes magnify the moon more then Stellarium does? I for sure can see that the moon is much bigger when I look outside then the white dot on-screen. Do any other factors come into play maybe?

Ok, so I guess Inception isn't a great example. If you look through a glass marble to the horizon, and move the marble up or down while keep looking through the marble, the sides of your view through the marble is greatly distorted. The horizon on the sides of the marble then go up or down, kinda like skating ramps. Example: http://1drv.ms/1MDaVGw This is not what I want.

I can't really check the visibility of the moon right now because its raining. But I know I see the moon bigger then this when its clear weather.

This is what I want to accomplish:

Imagine standing in a field. You hold an empty rectangular wooden frame. What I see through the frame, is what my view on my PC screen should be. I can hold the wooden frame close to me, so that I can see through the frame a greater FoV, or, I can stretch my arms, making my FoV smaller. Bringing the frame closer or further away only adjusts my FoV, but does not change magnification (or create any distortion).

Apparently this is bad joke. Why you compared view of the sky in Stellarium (with field of view in 171 degree) and field of view of the human eye (35 degrees)? If you want real view of the sky in Stellarium then just set FOV as FOV of the human eye.

Plus how much meters has diagonal line your half-spheric monitor?

Ah thank you gzotti! Yeah I did play with those, but hadn't checked out the "Perspective" projection, and that is the one I wanted.

Regarding your 2). I just googled some pictures of examples what I meant, but yeah, I'll experiment with zooming in/out.

Thanks again!

Thanks gzotti, that solved my question.