Newton invented the reflector telescope in the 1680's.
Sir Isaac Newton taught mathematics, physics and astronomy.
Mainly Physics, but also astronomy
by seeing a difference about the earth and suns movement
Newton contributed a Theoretical rational basis for Astronomical Motions. Prior basis for motion was religious or The Law of "Nature". Newton's Law of Gravity, revolutionized not only Astronomy, but Science.
Newton's most famous major discovery was the "Laws of Gravitation"
by seeing a difference about the earth and suns movement
His major contribution was the discovery of the principle of gravity on Earth and on other celestial bodies.
Almost all of our physical technology is derived in some way from Newtons contributions to science.
Isaac newtons first field of study was the discovery of gravity
De Revolutionibus, Principia Mathematica
Here is an example sentence with the word "contribution":Sir Issac Newton had made many contributions to science in his lifetime.
Isaac Newton 's branch of science was a physicist