[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) › c4.15 # Jyotihshastra: Astral and Mathematical Literature c4.15 Jyotiḥśāstra: Astral and Mathematical Literature c4.15 - **Language:** English ### [c4.15](https://indike.org/pramana/ins.science.pingree-1981.c4.15) 5 solar years = 1830 sidereal days = 62 synodic months = 1860 tithis (JV, Ṛk 32 = Yajus 5; Ṛk 4 = Yajus 13; Ṛk 18 = Yajus 39; Ṛk 8 = Yajus 9; and Ṛk 12 = Yajus 27).⁵ - [Previous: c4.14](https://indike.org/pramana/ins.science.pingree-1981.c4.14) - [Next: c4.16](https://indike.org/pramana/ins.science.pingree-1981.c4.16) - [Up: c4](https://indike.org/pramana/ins.science.pingree-1981.c4) ## Linked texts (1) - [Ārcajyotiṣa](https://indike.org/pramana/in.vedanga.jyotisa.rk) — Lagadha, Sanskrit --- Source: [https://indike.org/pramana/ins.science.pingree-1981.c4.15](https://indike.org/pramana/ins.science.pingree-1981.c4.15) · Pramāṇa