How Axies work on Unity Engine?

[Sirine]

Recently playing RSS (Real Solar System).

It seems that the RSS mod maker, can't make the Kerbin (Earth) tilt for an angle. Instead, he make the whole universe tilt to a ~35 degree.

At first, I thought that was a difference way to see it. Since universe don't really have up or down.

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Next, the problem.

I have a craft from Duna (Mars) transfer back to Kerbin (Earth), and it seem that the angle [AN]/[PN] will not stay constant. Once warp, the [AN]/[PN] will shift to a distance (a few 0.x degree).

After some thought. I believe, the centre for Axies, are not the same. In normal KSP, the Axies centre at the Kerbol (Sun), once you get your [AN]/[PN] to a 0 degree, it will stay there, except your move your ships to other direction.

In RSS, once you-warp at Kerbol (Sun) orbit, the craft is going with a 0 degree movement (Calculation), hence the angle will change.

『Difference reference point from the craft (reference to ksp Kerbal), and the planets that orbiting the Kerbol (sun) ã€Â

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Question:- How to solve this shifting angle? (Unity Engine? Config?)