[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) › c32.4 # Book of Indian Eras, with Tables for Calculating Indian Dates c32.4 Book of Indian Eras, with Tables for Calculating Indian Dates c32.4 - **Language:** English ### [c32.4](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c32.4) The only difference between this arrangement and that of the Hindu series is in the 5th intercalation, which was made in the 14th instead of in the 13th year. But in spite of this close agreement, I think it almost certain that the two cycles were independently developed, although they may perhaps have had a common origin. The difference in the \*mode of intercalation\* is so great that it seems quite impossible that one can have been borrowed from the other. In the Greek cycle, the intercalary month has a fixed position, while in the Indian cycle both the name and the position are constantly changing. The name of the intercalary month is determined in the following manner—" When two new moons fall within the same solar month, as for instance on the 1st and 30th of Chaitra, then the name of Chaitra, or the corresponding lunar month, is repeated, the year being then intercalary with 13 months. The extra month is called \*adhika\* (or added), and the other \*nija\* (or ordinary). By the rule of the Surya Siddhânta, the intercalated month is to be placed in the middle of the ordinary month. In Southern India the whole intercalary month is placed before the ordinary one. - [Previous: c32.3](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c32.3) - [Next: c32.5](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c32.5) - [Up: c32](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c32) ## Linked texts (1) - [Sūryasiddhānta](https://indike.org/pramana/in.astro.siddhanta.early.suryasiddhanta) — Maya, Sanskrit --- Source: [https://indike.org/pramana/ins.epigraphy.cunningham-1883.c32.4](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c32.4) · Pramāṇa