**An** **astronomical** **work**, **called** **the** **Surya-siddhanta** (" **knowledge** **of** **the** **Sun** "), **of** **uncertain** **authorship** **and** **probably** **belonging** **to** **the** 4th **or** 5th **century**, **was** **considered** **of** **great** **merit** **by** **the** **Hindus**, **who** **ranked** **it** **only** **second** **to** **the** **work** **of** **Brahmagupta**, **who** **flourished** **about** **a** **century** **later**.

598), **whose** **work** **entitled** **Brahma-sphuta-siddhanta** (" **The** **revised** **system** **of** **Brahma** ") **contains** **several** **chapters** **devoted** **to** **mathematics**.

**We** **refer** **to** **Bhaskara** **Acarya**, **whose** **work** **the** **Siddhanta-ciromani** (" **Diadem** **of** **an** **Astronomical** **System** "), **written** **in** 1150, **contains** **two** **important** **chapters**, **the** **Lilavati** (" **the** **beautiful** [**science** **or** **art**] ") **and** **Viga-ganita** (" **root-extraction** "), **which** **are** **given** **up** **to** **arithmetic** **and** **algebra**.

**English** **translations** **of** **the** **mathematical** **chapters** **of** **the** **Brahma-siddhanta** **and** **Siddhanta-ciromani** **by** **H**.

**Colebrooke** (1817), **and** **of** **the** **Surya-siddhanta** **by** **E**.

**With** **the** **respective** **and** **relative** **positions** **in** **the** **zodiac** **of** **the** **sun**, **moon** **and** **planets**, **the** **character** **of** **their** **action** 1 **Whitney**, **Notes** **to** **Surya-Siddhanta**, **p**. **zoo**.