In the context of space a couple of kilometers that a mountain provides isn’t valid. An AU (distance between sun and earth is roughly 150 million KM. Adding a 5 there does nothing ofc, it’s like giving a millionaire a dollar. It’s not a significant digit or change that it would change any calculations.

If we shifted the planet just 8000 km closer to the sun we would no longer be habitable (source: https://www.sciencefocus.com/space/how-much-closer-to-the-sun-could-earths-orbit-get-and-still-be-habitable/amp/) if anyone has a more trusted source would appreciate it as this is very interesting.

Anyways 8000 to 150 million is like 8 to 150,000, essentially nothing when you look at it like that. Giving 8 dollars to someone with 150,00$ will make no change to them whatsoever.