Based on Wikipedia I think the unit is milligals, where a gal is 1 centimeter per second squared.
That is a bit of an odd unit where g is ~980,000 milligals.
So these changes are extremely small.
So then the total variation is all within about 0.02% of gravities normal value
Newton’s laws, including gravity and motion, can be expressed in terms of differential equations.
Differential equations pretty much requires calculus, which just hadn’t been formalized yet.
Newton’s laws also provide convincing reasons for the necessity and legitimacy of calculus, by being able to derive orbits from his simple laws.
Neither are really bread as they are not leavened with yeast.