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225 BCE
Eratosthenes
He created the most useful observation technology of his time, the armillary sphere. This is important because him, as well as other astronomers, were able to use this device to make new theories and observations. -
140
Claudius Ptolemy
He created one of the first star catalogs. This is important because it was the most accurate of his time and widely accepted. He layed a basis for other astronomers to follow his star catalog for their theories and observations. -
1543
Nicolaus Copernicus
He made the heliocentric theory, that the Sun is the center of our solar system rather than the Earth. This is obviously important because it is true, and previous astronomers were mistaken that planets revolve around the Earth. -
Nov 11, 1572
Tycho Brahe
He made the most accurate lunar theory of his time by using the most advanced observation technology before the telescope. This was important because it was a new idea at the time and it was widely accepted. -
Johannes Kepler
He discovered that the planets, including the Earth, travel around the Sun in an elliptical shaped orbit, rather than a circle, and that the Sun does not move. This is important because it helped astronomers understand how our planets rotation and revolution affect our seasons and other things on Earth. -
Sir Isaac Newton
He created the three Laws of Motion and created a reflecting telescope. These are important because they helped astronomers understand gravity in our universe, which is obviously very important to astrology in general. -
Albert Einstein
He had a theory that light bends with mass (the relation between energy and mass) and confirmed it after observing a solar eclipse in 1919. This is important because the e=mc^2 theory that Einstein made from this has been used universally for a century.