V. Sarma (1997), "Suryasiddhanta", Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures edited by Helaine Selin, Springer, Further reading Victor J. Katz. A History of Mathematics: An Introduction'', 1998. External links Ahargana - The Astronomy of the Hindu Calendar Explains the various calendric elements of the Hindu calendar by means of astronomical simulations created using Stellarium. The definitions of the various calendric elements are obtained from Surya Siddhantha. Surya Siddhantha Planetary Model A geometric model that illustrates the Surya Siddhantha model of the orbital movement of the planets. In this model, the asterism are not stationary but exhibit high-speed movement which is faster than the planets. As a result the planets seem to "fall behind" thus creating orbital movement. Surya Siddhanta Sanskrit text in Devanagari Remarks on the Astronomy of the Brahmins, John Playfair (Archive) Hindu astronomy Hindu astrological texts Astronomy books History of geometry Articles containing video clips Indian astronomy texts Ancient Indian astronomical works Ancient Indian mathematical works