Ptolemy drew up a catalogue of 1080 stars based on the earlier work of Hipparchus.
After his death, his sons Hipparchus and Hippias succeeded him in the tyranny.
Hipparchus tries to invalidate this view of Eratosthenes, by sneering at the proofs on which it rests.
We will now return at once to Hipparchus, and see what comes next.
The difference between glory and hard work in astronomy is just the difference between Ptolemy and Hipparchus.
We must however commence, as Hipparchus does, with the southern regions.
Consequently, the length of the tropical year is now about ten seconds less than it was in the time of Hipparchus.
Ptolemy the astronomer was content with it, and according to him Hipparchus used no other.
A wall, built at great expense by Hipparchus, surrounded it, and Cimon planted long avenues of trees and erected fountains.
Statues were raised to Harmodius and Aristogeiton, who slew Hipparchus.