The Parahita system of computations introduced by Haridatta was a simplification of the system propounded in
Aryabhatiya by
Aryabhata. Haridatta introduced the following simplifications. The system was called Parahita meaning
suitable for the common man because it simplified astronomical computations and made it accessible for practice even for ordinary persons. • Haridatta dispensed with the numerical symbolism used by Aryabhata and replaced it with the more flexible
Katapayadi system. In this system, letters are used to represent digits and these letters are then used to invent meaningful words and sentences to denote specific numbers. These words and sentences could be remembered with much less effort. • Computations in Indian astronomy involved long numbers representing various parameters associated with the several celestial objects which are applicable for a
Mahayuga, a period of 4,320,000 years. To avoid computations with these large numbers, Haridatta introduced a smaller
Yuga, called a
Dhijagannupura-yuga, of 576 years or 210,389 days (which 1/7500 th part of a Mahyuga) and accurately determined the zero corrections for this sub-Yuga for the mean motion of the several planets. These corrections were then used to compute the mean planets for any given date. ==Works of Haridatta==