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The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.
Picture of Hipparchus
Corbis-Bettmann

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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