I think it was Galileo who measured the acceleration of gravity by direct observation.
Newton applied his equations to the universe, an object he could not possibly observe directly. It was the successful calculation of the orbit of a comet by Halley that first confirmed Newton's gravitation -- long after Newton was dead.
But don't let facts impede your ranting.
Still waiting for any creationist (or anyone else) to supply that rigorous proof of something in the physics or chemistry fields. It's funny, there are all these Freepers who think that the physical and chemical sciences are somehow much more hard and rigorous than the biological sciences. We see that particular claim again and again, but I've never met a single practicing physicist or chemist who agrees with them. Some limited areas of mathematics deal in rigorous proof. Everyone in the natural sciences deals with evidence and predictions and falsification.