Hipparchus

All about Hipparchus:
Father of Trigonometry
cr: my classmate Caralos

1. hipparchus

2. Biography of hipparchus Born: c.190bc Place of birth : N icaea, B ithynia, now ( I znik,Turkey ) School: School of A thens Nationality: Greek Occupation: Astronomer,Mathematician,Geographer Popularity: father of trigonometry Died: c.120bc Place of death: Island of the R hodes

3. Contributions Hipparchus was famous of his works for his incidental discovery of precession of the equinoxes He is known to have been working astronomer at least from 162 to 127 BC Hipparchus is considered the greatest ancient astronomical observer and by some,the greatest astronomer of antiquity P lutarch table hipparchus 103049 compound propositions that can be formed from ten simple proposition.

4. He was the first whose quantitative and accurate models for the motion of the Sun and Moon survive. Works of H ipparchus observations and techniques are adopted by the B abylonians and people of the Mesopotamia over centuries he developed trigonometry constructed trigonometric tables and he solved several problems of spherical trigonometry

5. With his solar and lunar theories and his trigonometry ,he may have been the first to develop a reliable method to predict solar eclipses.

6. achievements His other reputed achievements include the discovery and measurement of Earth`s precession , the compilation of the S tar catalogue of the western world.

7. inventions Astrolable Armillary sphere Which he used during the creation of much of the star catalogue. I t would be three centuries before Claudius Ptolemaeus ` synthesis of astronomy would supersede the work of H ipparchus

8. Hipparchus was the first mathematician known to be have posessed a trigonometric table , which he needed when computing the eccentricity of the orbits of the moon and sun .

9. Geographical works Hipparchus's work on geography was a criticism, in three books, of Eratosthenes. In his discussion of Eratosthenes's geography he is concerned with mathematical errors in determining the latitudes of, and distances between, places. He evidently desired to establish a coordinate system of parallels of longitude and latitude for determining geographical positions, such as he employed for fixing the positions of the fixed stars. The data at his disposal, however, especially those concerning terrestrial longitude, were not sufficient to carrier out his scheme

10. legacy The rather cumbersome formal name for ESA`s Hipparchus Space Astrometry Mission was high precision parallax collecting satellite;it was deliberately named in this way to give an acronym, HiPParCoS ,that comet the name of Hipparchus. The lunar crater Hipparchus and the asteroid 4000 Hipparchus are more directly named after him.

11. monument The astronomer`s monument at the Griffith Observatory in Los Angeles California , United States of America features a relief of Hipparchus as one of the six greatest Astronomers of all time and the only one from A ntiquit .

12. books 2 books on precession Titled on sizes and distance On the displacement of the S olistical and equicnotial points. On the length of the year

13. Trivia Do you know that H ipparchus use the D ioptra which invented by heron ? To measure the apparent diameter of the sun and moon. He was the first to be able to measure the geographical lattitude and time by observing fixed stars. He`s interest is to observe constellations and zodiac signs.

14. Equatorial ring An  equatorial ring  was an astronomical instrument used in the  Hellenistic world  to determine the exact moment of the  spring  and  autumn equinoxes . Equatorial rings were placed before the temples in  Alexandria , in  Rhodes , and perhaps in other places, for  calendar  purposes.