I've been working on a system that has a few tidally locked planets recently, but I've noticed a subtle shift in the planets orientation after like 5 orbits, which after a lot of orbits adds up and it's completely flipped, which is a problem due to the sunny side being magma and the night side being ice. Because the rotation is mostly accurate I doubt I did the math wrong, it's probably that the orbital period readout just doesn't get that accurate, and to get an accurate enough number for the tidal locking to work id have to calculate it myself, something that I wouldn't have to figure out if there was a place where I could get a few more decimal places on the orbital period readout.
