RESPECT HIPPARCHUS'S AUTHORITY, OR ELSE!
 HIPPARCHUS
     Hipparchus was born in Nicaea in Bithynia, but spent much of his life in Rhodes. He is generally considered to be one of the most influential astronomers of antiquity, yet very little information available about him survives; his only extant work is his commentary on the astronomical poem of Aratus (third century B.C.), the Commentary on the Phainomena of Eudoxus and Aratus. Other works by Hipparchus (now lost) included an astronomical calendar, books on optics and arithmetic, a treatise entitled On Objects Carried Down by their Weight, geographical and astrological writings, and a catalogue of his own work. The Almagest, written by Ptolemy (second century A.D.) is the source of most of our knowledge about Hipparchus, who Ptolemy considered to be his most important predecessor. In his own astronomical work, Ptolemy made extensive use of the work of Hipparchus, building on the foundation laid by him. Ptolemy described Hipparchus as 'industrious' and, repeatedly, as a great 'lover of truth'. That Hipparchus continued to be held in high regard is demonstrated by the various depictions of him on frontispieces of astronomical works published long after his death.
from(www.hps.cam.ac.uk/starry/hipparchus.html-8k)

                                                                                                       The greatest of the Greek astronomers.  Hipparchus found the distance to the Moon  using parallax, and, independently of Kiddinu of Babylon, discovered procession of the equinoxes  by comparing his observations with those of Timocharus 150 years earlier. Hipparchus's model was a mathematical, not mechanical model, and it provided a simpler explanation of stations and retrogressions that did Eudoxus's hippopede.
from(scienceworld.wolfram.com/biography/Hipparchus.html-similar pages)

Hipparchus in my eyes has contributed to the history of science in many ways. He has classified the stars in magnitudes of there brightness, which I think is amazing.  Hipparchus contributed to the discovery of why we have different lengths of the seasons, by following the path that Apollonius took. He offset the Earth from the center of the planets. He invented latitudes and longitudes and was the first to measure the moons distances and angles in relation to the Earth. He created the first accurate star map. Hipparchus also contributed to the founding of trigonometry. Very little is known about Hipparchus's life. Hipparchus measured the precession of the Earth's rotation axis.While the North Celestial Pole today is near the star Polaris, in 3000 B.C., it was near the star Thuban in the constellation Draco, and in 14,000 A.D. , it will be found near the star Vega in the constellation Lyra. This is why I think Hipparchus's work and accomplishments play a very important role in our everyday life.                                                                                                        
BIBLIOGRAPHY

www.hps.cam.ac.uk/starry/hipparchus.html-8k
scienceworld.wolfram.com/biography/Hipparchus.html-similar pages

JONATHAN DUBOIS