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Portrait of Tycho Brahe
The Institute and Museum of the History of Science in Florence, Italy.

Tycho Brahe

Tycho Brahe was a Danish astronomer who lived between 1546-1601. Although Tycho had his own model of the solar system, which differed from both the heliocentric and geocentric theories, his contributions to astronomy were primarily observational.

For over twenty years, Tycho made very accurate observations of the night sky, all without the aid of a telescope which had not yet been invented. He also built the world's first observatory and kept a star catalogue with over 1000 stars.

Tycho's records were later used by Johan Kepler to describe the orbits of planets around the sun and refute the Ptolemaic theory.


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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF