Hipparchus

The lunar crater Hipparchus and the asteroid 4000 Hipparchus are more directly named after him.

This would be the second eclipse of the 345-year interval that Hipparchus used to verify the traditional Babylonian periods: this puts a late date to the development of Hipparchus's lunar theory.

Ulugh Beg reobserved all the Hipparchus stars he could see from Samarkand in 1437 to about the same accuracy as Hipparchus's.

The plot miscarried, however, and they succeeded in killing only Hipparchus.

The Greek astronomer Hipparchus, who lived around 120 B.C., has been regarded as the father of trigonometry.

According to Ptolemy, Hipparchus measured the longitude of Spica and Regulus and other bright stars.

Although he wrote at least fourteen books, almost nothing of Hipparchus ' direct work survived.

Apparently Hipparchus later refined his computations, and derived accurate single values that he could use for predictions of solar eclipses.

As with most of his work, Hipparchus's star catalog was adopted and perhaps expanded by Ptolemy.

At the end of his career, Hipparchus wrote a book called Peri eniausíou megéthous ("On the Length of the Year") about his results.

Based partly on data taken from Pytheas, Hipparchus correlated cubits of the sun's elevation at noon on the winter solstice, latitudes in hours of a day on the summer solstice, and distances between latitudes in stadia for some locations.

But some scholars do not believe Arayabhatta's Sin table has anything to do with Hipparchus's chord table which does not exist today.

Chartrand, p. 172. It was not separated from Centaurus until Hipparchus of Bithynia named it Therion (meaning beast) in the 3rd century BC.

Cicero describes one invented by Archimedes; Hipparchus had made another; two first century A.D. models were commemorated in the Greek Anthology;', Thomas, 'Paths from Ancient Greece', p. 69 (1988).

Distance, parallax, size of the Moon and the Sun main Diagram used in reconstructing one of Hipparchus's methods of determining the distance to the moon.

First conceived by the Greek astronomer Hipparchus in the second century BC, the original concept of magnitude grouped stars into six discrete categories depending on how bright they appeared.

He also acknowledged ancient astronomer Hipparchus for having provided the elevation of the north pole for a few cities.

Hipparchus also undertook to find the distances and sizes of the Sun and the Moon.

Hipparchus and Pliny made this a separate, though connected, constellation.

Hipparchus apparently made many detailed corrections to the locations and distances mentioned by Eratosthenes.