Dictionary and Language Portal
Online Dictionary
Allmath Homepage
Math Tools
Flash Cards!!!
Metric Converter
The Magic Square
Reference Pages
Math Glossary
Math Headlines
Multiplication Table
Metric Factors
Biographies of Math
Other Math Links
Ask The Experts
Visit Dr. Math
Visit our Dictionary
About allmath.com
Who are We?
Contact Us

Hipparchos / Hipparchus



Astronomer, born in Nicaea, Rhodes. He carried out observations at Rhodes, discovered the precession of the equinoxes and the eccentricity of the Sun's path, determined the length of the solar year (to within seven minutes), estimated the distances of the Sun and Moon from the Earth, and drew up a catalogue of 1080 stars. He also fixed the geographical position of places by latitude and longitude, and invented trigonometry.

Mathematicians biographies text content is © (1990), (1991-1998)
AND Reference Data Ltd.,Oxford, UK.

copyright © 1997-2014 Allsites LLC. All rights reserved.
allmath.com, mathbook.com and "virtual mathbook" ® are all service marks of Allsites LLC.
periodic table metric conversion