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Picture of Hipparchus
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Hipparchus

Hipparchus was a Greek astronomer who lived between 190-120 B.C. He is considered the father of trigonometry, a branch of mathematics which studies the angles of sides of triangles.

Hipparchus also developed the first accurate star map. It included over 850 stars, as well as descriptions of their brightness.


Last modified July 25, 2001 by Jennifer Bergman.

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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