Eclipses can be predicted with sharp accuracy

Yea, Yea, providing you have factored-in all relevant variables.

I give you ice, at the poles and in glaciers. Then there is the rebound in the crust ( or lack of it going backwards). It changes the rotation and wobble. And, and, and..........

Chaos rules. Unless you have the factors. And know that wherever you get the calculations from has factored enough of these things. Small differences? Pah, chaos theory laughs in the face of your small differences.

Evidence based science. You had to be there, &/or armed with those factors.

But historical accounts are not without uncertainty.

who mentioned dark matter/energy?