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He was the first person to say that the earth wasnt the center of the universe, but the sun was more likely. little did he know that the sun wasnt the center of the universe either!
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He used quadrants to help measure the distance of the planets and stars. (there were no telescopes)
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He discovered that all objects fall at the same rate no matter what their mass is. (I personally dont believe this because a bowling ball falls much faster than a feather)
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He did many things but he invented the telescope.
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Discovered that Halleys comet returns once every 76 years.
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Built a 48 inch telescope to help see furter into space. It was the largest for 50 years.
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He was the person who proved A.I. comisoligical constant to be wrong.
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Einstien effected many things but he mainly changed the thought on the nature of light, gravity, and time.
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Claudius Ptolemy was the first well known astronmer and helped create over 40 of the constilations in our sky today.