Astrophysics (index)about


(Greek astronomer who developed concept of magnitude)

Hipparchus is a Greek astronomer of Nicaea, c190BC-c120BC. He compiled a star Catalog, dividing stars into six Magnitude classes by brightness, the system which has evolved into the present system. The catalog is lost, but in 2005, an ancient statue was shown to display the data graphically.

Hipparchus also made critical measurements of the seasons, the Lunar cycle, and the solar year.


Referenced by:
Astronomical Catalog