[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Archaeology, epigraphy and coins](https://indike.org/pramana/ins.epigraphy) › [Book of Indian Eras, with Tables for Calculating Indian Dates](https://indike.org/pramana/ins.epigraphy.cunningham-1883) › c2.40 # Book of Indian Eras, with Tables for Calculating Indian Dates c2.40 Book of Indian Eras, with Tables for Calculating Indian Dates c2.40 - **Language:** English ### [c2.40](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c2.40) If this conclusion be right, then the Hindus of the 1st and 2nd centuries A.D. must have had a nearly accurate knowledge of the length of the solar year, the amount of error being only one day in 76 years. It seems to me, therefore, not improbable that a fairly accurate adaptation of the cycle of Jupiter to the reckoning of the solar year may be as old as the time of the Indo-Scythians, who made use of the Macedonian calendar in their inscriptions. Of course this is not a proof that the reckoning of the Arya and Surya Siddhântas was in use at so early a period. But it is, in my opinion, a very strong argument that a nearly accurate reckoning must already have been adopted. - [Previous: c2.39](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c2.39) - [Next: c2.41](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c2.41) - [Up: c2](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c2) ## Linked texts (2) - [Sūryasiddhānta](https://indike.org/pramana/in.astro.siddhanta.early.suryasiddhanta) — Maya, Sanskrit - [Mahāsiddhānta (Āryasiddhānta)](https://indike.org/pramana/in.astro.siddhanta.early.aryasiddhanta2) — Āryabhaṭa II, Sanskrit --- Source: [https://indike.org/pramana/ins.epigraphy.cunningham-1883.c2.40](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c2.40) · Pramāṇa