[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [Jyotihshastra: Astral and Mathematical Literature](https://indike.org/pramana/ins.science.pingree-1981) › c4.s2.21 # Jyotihshastra: Astral and Mathematical Literature c4.s2.21 Jyotiḥśāstra: Astral and Mathematical Literature c4.s2.21 - **Language:** English ### [c4.s2.21](https://indike.org/pramana/ins.science.pingree-1981.c4.s2.21) Āryabhaṭa wrote a second work that formed the basis of the Ardharātrikapakṣa, apparently entitled Āryabhaṭasiddhānta. This is now lost, though a number of astronomers have mentioned its views, and some commentators—especially on the Sūryasiddhānta—have quoted its verses.⁴¹ Especially prevalent in these quotations are verses describing Āryabhaṭa’s simple and crude observational instruments (e.g., by Mallikārjuna Sūri⁴² and by Tammayajvan⁴³) and his clepsydras (by Tammayajvan and by Rāmakṛṣṇa). The first treatise to follow the Ārdharātrikapakṣa of the Āryabhaṭasiddhānta was a revised version of the Sūryasiddhānta. This was composed by a pupil of Āryabhaṭa named Lāṭadeva⁴⁴ according to the information available to Al-Bīrūnī; and there is no good reason to doubt this attribution. As summarized by Varāhamihira in the PS it is a karaṇa rather than a siddhānta; its epoch is midnight 20/21 March 505. It is nuclear whether this form is that of Lāṭadeva’s original, or was imposed on it by Varāhamihira. - [Previous: c4.s2.20](https://indike.org/pramana/ins.science.pingree-1981.c4.s2.20) - [Next: c4.s2.22](https://indike.org/pramana/ins.science.pingree-1981.c4.s2.22) - [Up: c4.s2](https://indike.org/pramana/ins.science.pingree-1981.c4.s2) ## Linked texts (3) - [Sūryasiddhānta](https://indike.org/pramana/in.astro.siddhanta.early.suryasiddhanta) — Maya, Sanskrit - [Āryabhaṭasiddhānta (ārdharātrika system)](https://indike.org/pramana/in.astro.siddhanta.early.aryabhatasiddhanta) — Āryabhaṭa, Sanskrit - [Pañcasiddhāntikā](https://indike.org/pramana/in.astro.siddhanta.early.pancasiddhantika) — Varāhamihira, Sanskrit --- Source: [https://indike.org/pramana/ins.science.pingree-1981.c4.s2.21](https://indike.org/pramana/ins.science.pingree-1981.c4.s2.21) · Pramāṇa