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SOLAR SYSTEM
Lesson 1 - Page 3

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Movement of the Sun and planets in relationship to the stars have always been a problem. The ancient Greeks provided a system developed by Ptolemy (90-168), where the Earth is the center of all movement. The Sun and other stars revolve around us. This sounds logical, until you really look at the night time sky.

Nicholas Copernicus (1473-1543), from what is now Poland, disposed of the Earth as the Universe's center, by placing the Sun in the central position, with the planets (including Earth) revolving around the Sun. Copernicus was the first of many people in the 1600's who started to develop a scientific way of looking at the skies.


Copernicus charting planet movement.

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