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Claudius Ptolemy lived in Rome around 100 AD. His model of the solar system and heavenly sphere was a refinement of previous models developed by Greek astronomers. Ptolemy’s major contribution, however, was that his model could so accurately explain the motions of heavenly bodies, it became the model for understanding the structure of the solar system.
Ptolemy's system -
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Copernican Model This heliocentric concept (sun-centered concept) was a radical idea for his time. Nearly all contemporary astronomers had adopted the Greek Earth-centered model. It was so radical a concept, in fact, that Copernicus waited until the year of his death to publish his famous essay titled, “On the Revolutions of the Heavenly Spheres.”
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Tycho's Model King Fredrick II of Denmark built Tycho Brahe an observatory to measure the position of planets with high accuracy. However, the telescope had not yet been invented, so the observatory was a naked eye observatory with oversized instruments.
