The Surya Siddhanta was composed in the 5th century CE, although some scholars believe that it may have been composed earlier.

Aryabhata is traditionally credited with authoring the Surya Siddhanta, although some scholars believe that it may have been a collaborative effort.

The main purpose of the Surya Siddhanta is to provide a comprehensive system of astronomy that can be used to calculate the positions of the planets, predict eclipses, and calculate the time of sunrise and sunset.

The most important astronomical model presented in the Surya Siddhanta is the geocentric model, which places the Earth at the center of the universe and has the Sun, Moon, and planets orbiting around it.

The Surya Siddhanta was the first text to use trigonometry in astronomy, which allowed for more accurate calculations of the positions of the planets and other celestial bodies.

The Surya Siddhanta led to the development of new astronomical instruments, the establishment of new observatories, and the development of new mathematical techniques, all of which contributed to the advancement of astronomy in India.

The Surya Siddhanta was translated into Arabic and Persian, and it was used by astronomers in China and Europe. It also led to the development of new astronomical models, all of which contributed to the advancement of astronomy beyond India.

The Surya Siddhanta does not account for the precession of the equinoxes, the nutation of the Earth's axis, or the aberration of light, which are all important factors in calculating the positions of celestial bodies.

Despite its limitations, the Surya Siddhanta is still considered an important text in the history of astronomy because it was the first text to use trigonometry in astronomy, which allowed for more accurate calculations of the positions of the planets and other celestial bodies.

The Surya Siddhanta is still used in the design of sundials, the calculation of astrological charts, and the development of astronomical software.