What was the importance of alexis clairauts correct prediction of when halleys comet would return?

Alexis Clairaut a French astronomer and mathematician whom also a prominent Newtonian whose work facilitated to create the validity of the principles that predict regarding Halley’s comet and gives importance which demonstrated and evidenced that the theories of motion and gravity are correct which is Isaac Newton’s Theory.

I believe it’s a because the Vietnamese reaturned American pows so I think we did the same