Hipparchus was a Greek astronomer and mathematician. He is known for discovering the change in the orientation of the Earth’s axis and the axis of other planets with respect to the center of the Sun. He was also the inventor of trigonometry. He had immense in geography and was one of the most famous astronomers in ancient times. He made the first models of the motion taken by the Sun and the Moon which are considered very accurate even in modern times. It is believed that he had used the mathematical formulas derived by the Mesopotamians and the Babylonians over the centuries to arrive at his conclusions. He was the founder of trigonometric tables and was the first one to solve many of the problems related to the trigonometry of spheres. He was possibly the first astronomer to predict the occurrence of solar eclipses with the help of trigonometry and his theories on the movement of the Sun and the Moon. His other great discovery was the accurate calculation of the equinox precession, creation of the first star catalog in the western world, development of the ‘astrolabe’ and the ‘armillary sphere’. His discoveries and creations could only be superseded after three centuries by Claudius Ptolemaeus. Very few documents are available on his life and works.