Added to the Copernican / Heliocentric model | Measures position of objects by eye -> down to 1 arcminute | Creates a comprehensive data set of stars, planetary motion | His data is the basis for developing Kepler's Laws

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1. Added to the Copernican / Heliocentric model | Measures position of objects by eye -> down to 1 arcminute | Creates a comprehensive data set of stars, planetary motion | His data is the basis for developing Kepler's Laws