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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. For over twenty years he made observations of stars, comets, and planets in the night sky. Tycho also built the first observatory but did not use telescopes because they hadn't been invented yet.

Tycho's records were used by Johan Kepler to describe the orbits of planets around the sun.


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Motions of the Planets

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Nicholas Copernicus

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Galileo Galilei

Galileo Galilei was an Italian astronomer and physicist who lived between 1564-1642. He was the first person to use a telescope to look at the heavens, and discovered craters in the moon. Galileo found...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA