[Pramāṇa](https://indike.org/pramana/) › [Indian literature](https://indike.org/pramana/in) › [Astronomy & Mathematics](https://indike.org/pramana/in.astro) › [Mathematical Astronomy](https://indike.org/pramana/in.astro.siddhanta) › [Sanskrit works on Islamic astronomy](https://indike.org/pramana/in.astro.siddhanta.islamic) › Siddhantaraja # Siddhantaraja (Siddhāntarāja) सिद्धान्तराज Following the sāyana system (tropical instead of sidereal length of year); contains two adhyāyas. - **Language:** Sanskrit - **Date:** 1614–1664 CE - **Author:** [Nityānanda](https://indike.org/pramana/person/nityananda) - **Text:** not yet digitised (catalogue entry) --- Source: [https://indike.org/pramana/in.astro.siddhanta.islamic.siddhantaraja](https://indike.org/pramana/in.astro.siddhanta.islamic.siddhantaraja) · Pramāṇa