from The American Heritage® Dictionary of the English Language, 4th Edition
- Hipparchus 1 Died 514 B.C. Athenian tyrant (527-514) who ruled with his brother Hippias and was assassinated.
- Hipparchus 2 fl. second century B.C. Greek astronomer who mapped the position of 850 stars in the earliest known star chart. His observations of the heavens form the basis of Ptolemy's geocentric cosmology.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. An ancient Greek astronomer, geographer, and mathematician.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. Greek astronomer and mathematician who discovered the precession of the equinoxes and made the first known star chart and is said to have invented trigonometry (second century BC)
Of the two methods of expression Hipparchus ultimately preferred the second.
From the comparison of the secular inequalities in the motions of the Moon with the eclipses observed in ancient times, it follows that, since the time of Hipparchus, that is, for full 2000 years, the length of the day has certainly not diminished by the hundredth part of a second.
Victor, that the emperor Marcus Aurelius obliged the inhabitants of Nice to send yearly to Rome a certain quantity of corn, for having beaten one of their citizens, by name Hipparchus, a man of great learning and extraordinary accomplishments.
A General History and Collection of Voyages and Travels - Volume 18 Historical Sketch of the Progress of Discovery, Navigation, and Commerce, from the Earliest Records to the Beginning of the Nineteenth Century, By William Stevenson
Concepts akin to those deployed in Philoponus 'impetus theory appear in earlier writers such as Hipparchus (2nd c.
Hipparchus 190–120 BC, the founder of Greek astronomy, counted 1,080 stars in the sky.
In the sources of the hellenistic period we even find corrections Geminus Rhodius corrects beholding signs according to precession and a whole attempt by Hipparchus, first, and Ptolemy, later, for the accuracy of calculations.
The Greek astronomer Hipparchus discovered the precession of the equinoxes.
However, by the time Hipparchus had made his discovery, the Sun was almost out of Aries as well.
After the death of Pisistratus in 527 BCE, Hipparchus became tyrant of Athens, ruling with his older brother Hippias.
In 514 BCE, Hipparchus was murdered by Harmodius and Aristogeiton, two members of the Gephyraei family, at the Panathenaea festival.