Aryabhata, also called Aryabhata I or Aryabhata the Elder, (born 476, possibly Ashmaka or Kusumapura, India), astronomer and the earliest Indian mathematician whose work and history are available to modern scholars.

 Aryabhata's definitions for cosine, sine, inverse sine, verse sine gave birth to Trigonometry. He was one of the first mathematicians to determine sine and versine (1-cosx) tables from 0 to 90 degrees in the interval of 3.75 degrees to an accuracy of 4 decimal places.

 The modern names of Trigonometric functions, sine and cosine are derived from the Sanskrit words “jya” and “Kojya” which were introduced by him.

The geocentric model of the solar system was described by Aryabhata, scientifically explaining the solar and lunar eclipses.  He also estimated the length of the year to be 365 days 6 hours 12 minutes 30 seconds which only deviates from today’s calculations by 3 minutes 20 seconds.