The first known trigonometric table, compiled by Hipparchus, tabulated the value of the chord function for every 7. 5 degrees.

Along with Shi Shen, he is believed to be the first in history known by name to compile a star catalogue, preceded by the anonymous authors of the early Babylonian star catalogues and followed by the Greek Hipparchus who is the first known in the Western tradition to have compiled a star catalogue.

This can be dated back to Hipparchus, who around 190 BC used the catalogue of his predecessors Timocharis and Aristillus to discover the earth ’ s precession.

Like the earlier catalogs of Hipparchus and Ptolemy, Ulugh Beg's catalogue is estimated to have been precise to within approximately 20 minutes of arc.

The Almagest also contains a star catalogue, which is an appropriated version of a catalogue created by Hipparchus.

The star catalog of Hipparchus ( 2nd century BC ) included 1020 stars and was used to assemble Ptolemy's star catalogue.

Hipparchus ( c. 190 – c. 120 BC ) completed his star catalogue in 129 BC, which he compared to Timocharis ' and discovered that the longitude of the stars had changed over time.

Ptolemy's catalogue was based almost entirely on an earlier one by Hipparchus ( Newton 1977 ; Rawlins 1982 ).

* Hipparchus creates a star catalogue.

* Space. com article on the Hipparchus ' star catalogue found.

Linguistically, the association of horse ownership with social status extends back at least as far as ancient Greece, where many aristocratic names incorporated the Greek word for horse, like Hipparchus and Xanthippe ; the character Pheidippides in Aristophanes ' Clouds has his grandfather's name with hipp-inserted to sound more aristocratic.

Although Strabo cited the antique Greek astronomers Eratosthenes and Hipparchus, acknowledging their astronomical and mathematical efforts towards geography, he claimed that a descriptive approach was more practical, such that his works were designed for statesmen who were more anthropologically than numerically concerned with the character of countries and regions.

Historically, Hipparchus is credited with discovering precession of the equinoxes.

Ptolemy measured the longitudes of Regulus, Spica, and other bright stars with a variation of Hipparchus ' lunar method that did not require eclipses.

Ptolemy compared his own observations with those made by Hipparchus, Menelaus of Alexandria, Timocharis, and Agrippa.

Hipparchus dropped one more day from four Callipic cycles ( 304 years ), creating the Hipparchic cycle with an average year of 365 + 1 / 4 − 1 / 304 or 365. 24671 days, which was close to his tropical year of 365 + 1 / 4 − 1 / 300 or 365. 24667 days.

Ptolemy selected the best of the astronomical principles of his Greek predecessors, especially Hipparchus, and appears to have combined them either directly or indirectly with data and parameters obtained from the Babylonians.

This system is believed to have originated with Hipparchus.

For the Moon, Ptolemy began with Hipparchus ' epicycle-on-deferent, then added a device that historians of astronomy refer to as a " crank mechanism ": He succeeded in creating models for the other planets, where Hipparchus had failed, by introducing a third device called the equant.

Eratosthenes calculated the earth's circumference with remarkable accuracy, and Hipparchus Founded scientific astronomy.

His brother Hipparchus, who may have ruled jointly with him, was murdered by Harmodius and Aristogeiton ( the Tyrannicides ) in 514 BC.

Hipparchus had fallen in love with Harmodius, who was already the lover of Aristogeiton.

When Peisistratus died in 528 / 527 BC, his son Hippias, with the help of his younger brother Hipparchus, retained power.

This was an offense of such magnitude to Harmodius ' family that he, together with Aristogeiton who was already fired by feelings of jealousy due to Hipparchus having made unrequited sexual advances toward Harmodius ( possibly the motivation for Hipparchus's humiliation of Harmodius's sister ), resolved to assassinate both Hippias and Hipparchus and thus to overthrow the tyranny.

Here he became acquainted with the poet Simonides, and other members of the brilliant circle which had gathered round Hipparchus.

Gaps in the northwest rim of Hipparchus form valleys that connect with the mare to the northwest.

Hind and the craters Hipparchus C and Hipparchus L form a line with diminishing diameters that point to the northeast.

His maternal grandmother with his father were sister and brother His maternal uncle Lucius Vibullius Hipparchus was an Archon of Athens in the years 99-100 and his maternal cousin, Publius Aelius Vibullius Rufus was an Archon of Athens between 143-144.

* St. Lollianus, one of the Seven Martyrs of Samosata, crucified with Saint Hipparchus and Philotheus, Abibus, James, Paregrus and Romanus by the emperor Maximian in 297 for their refusal to participate in public worship of the Roman gods.

His statistical analysis concludes that the positions of these constellations are consistent with where they would have appeared in the time of Hipparchus ( 129 BC )-leading to the conclusion that the statue is based on the star catalog.

An important role in this standardisation appears to have been played by the Athenian tyrant Hipparchus, who reformed the recitation of Homeric poetry at the Panathenaic festival.

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

Although Greek astronomers had known, at least since Hipparchus, that the tropical year was a few minutes shorter than 365. 25 days, the calendar did not compensate for this difference.

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.

Hipparchus, through Strabo, adds that Byzantium and the mouth of the Borysthenes, today's Dnepr river, were on the same meridian and were separated by 3700 stadia, 5. 3 ° at Strabo's 700 stadia per a degree of meridian arc.

Hipparchus is the earliest known astronomer to recognize and assess the precession of the equinoxes at about 1º per century ( which is not far from the actual value for antiquity, 1. 38º ).

Hipparchus had already developed a way to calculate the longitude of the Sun at any moment.

Ceos lies only some fifteen miles south-east of Attica, whither Simonides was drawn, about the age of thirty, by the lure of opportunities opening up at the court of the tyrant Hipparchus, a patron of the arts.

If the stories of rivalry are true, it may be surmised that Simonides's experiences at the courts of the tyrants, Hipparchus and Scopas, gave him a competitive edge over the proud Pindar and enabled him to promote the career of his nephew, Bacchylides, at Pindar's expense.

Although Ptolemy relied mainly on the work of Hipparchus, he introduced at least one idea, the equant, which appears to be his own, and which greatly improved the accuracy of the predicted positions of the planets.

Gerard translated the Arabic text while working at the Toledo School of Translators, although he was unable to translate many technical terms such as the Arabic Abrachir for Hipparchus.

A remarkable statement mentioned by Diogenes Laertius ( c. 250 AD ) is the earliest ( or at least one of the earliest ) references about plausible centenarian longevity given by a scientist, the astronomer Hipparchus of Nicea ( c. 185 – c. 120 BC ), who, according to the doxographer, was assured that the philosopher Democritus of Abdera ( c. 470 / 460 – c. 370 / 360 BC ) lived 109 years.

Hipparchus invited Harmodius ' young sister to be the kanephoros ( to carry the ceremonial offering basket ) at the Panathenaea festival, and then publicly chased her away on the pretext she was not a virgin, as required.

On the death of Polycrates, Hipparchus, who was then in power at Athens and inherited the literary tastes of his father Peisistratus, sent a special embassy to fetch the popular poet to Athens in a galley of fifty oars.

In 2005, at a meeting of the American Astronomical Society in San Diego, California, Dr. Bradley E. Schaefer, a professor of physics at Louisiana State University, presented a widely reported analysis concluding that the text of Hipparchus ' long lost star catalog may have been the inspiration for the representation of the constellations on the globe, thereby reviving and expanding an earlier proposal by Georg Thiele ( 1898 ).

By examining the positions of the constellations, Schaefer determined that they are accurately placed according to the positions they occupied at the time of Hipparchus.

Hipparchus, whose works are mostly lost and known mainly from quotations by other authors, assumed that the Moon moved in a circle inclined at 5 ° to the ecliptic, rotating in a retrograde direction ( i. e. opposite to the direction of annual and monthly apparent movements of the Sun and Moon relative to the fixed stars ) once in 18 years.

* The Moon's equation of the center, or elliptic inequality, was known at least in approximation, to the ancients from the Babylonians and Hipparchus onwards.