Hipparchus was a famous Greek astronomer, mathematician, and geographer born around 190 BC in Nicaea, Bithynia. He made many important contributions including discovering the precession of the equinoxes and compiling one of the earliest star catalogs in the Western world. Hipparchus is considered one of the greatest astronomers of antiquity and developed trigonometry and trigonometric tables, making him an important figure in the development of astronomy. He made accurate models for the motion of the Sun and Moon and may have been the first to develop a reliable method for predicting solar eclipses.

2.  Born: c.190bc
Place of birth : Nicaea, Bithynia, now
(Iznik,Turkey)
 School: School of Athens
 Nationality: Greek
 Occupation:
Astronomer,Mathematician,Geographer
 Popularity: father of trigonometry
 Died: c.120bc
 Place of death: Island of the Rhodes

3.  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
 Plutarch 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 Hipparchus observations and
techniques are adopted by the Babylonians
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.  His other reputed achievements include the
discovery and measurement of Earth`s
precession, the compilation of the Star
catalogue of the western world.

7.  Astrolable
 Armillary sphere
 Which he used during the creation of much of
the star catalogue.
It would be three centuries before Claudius
Ptolemaeus` synthesis of astronomy would
supersede the work of Hipparchus

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.  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.  The rather cumbersome formal name for
ESA`s Hipparchus SpaceAstrometry 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.  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 Antiquit.

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

13.  Do you know that Hipparchus use the
Dioptra 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. An equatorial ring was an astronomical
instrument used in the Hellenistic world to
determine the exact moment of
the spring and autumnequinoxes. Equatorial
rings were placed before the temples
in Alexandria, in Rhodes, and perhaps in other
places, for calendar purposes.