# How can I see a star behind a mountain range? Do I move apart from it and up?

Could some explain what I need to do to see a star that, from my point of view, is behind a mountain:

Obviously, if it's one mountain, and not a very high one, I can just climb it to see what's behind. But what if it's a mountain range or a very high mountain?

Intuitively, I know I can move away from it to change the angle, and see the star. But what's the math behind it? And how does going up (or down, maybe?) help?

• I'm stuggling to see the problem. It's no different from being unable to see an object because something opaque that's in the line of sight between you and whatever you want to see. Commented Dec 24, 2020 at 10:48
• If the mountain is to your east, wait 2 hours. If it's to your west, wait 22 hours. Commented Dec 24, 2020 at 14:01
• @MikeG the last sentence of the question already acknowledges this to some extent, and asks for the math behind it. You've arrived at two actual numbers, if you can demonstrate the mathematics you've used to get them, then that's the answer.
– uhoh
Commented Dec 26, 2020 at 23:02