Tycho Brahe's most important contribution to the development of modern astronomy was the:

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Tycho Brahe's most important contribution to the development of modern astronomy was his accurate measurement of planetary positions. He built and used the best astronomical instruments of his time to make precise measurements of the positions of the planets and stars. These measurements were later used by Johannes Kepler, who was Brahe's assistant, to develop his laws of planetary motion. Brahe's data also provided evidence against the Aristotelian view of the universe, which held that the heavens were unchanging and perfect.

Tycho Brahe's Most Important Contribution to the Development of Modern