Far from nearby objects, even deep space probe location calculations are approximations. All models are wrong; a very small number are useful, sometimes.
Mathematics is eternal, without time, space, or energy, an inseparable branch of God. It's a perfect truth, while all our senses of the real world are approximations, technically lies. It's easy to ascribe God-tier perfection to mathematical models, but the perfection is only with the math itself, never its application to reality.
Variables.
From time to time I like playing this game
https://www.stefanom.org/spc/index.html
to amuse myself, plus it does help me to visualize what can happen when different planetary bodies interact with each other.
Agree!