[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) › c18.7 # Book of Indian Eras, with Tables for Calculating Indian Dates c18.7 Book of Indian Eras, with Tables for Calculating Indian Dates c18.7 - **Language:** English ### [c18.7](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c18.7) As the 12th part of one revolution of Jupiter is considerably more than four days less than one solar year, a difference which amounts to one whole year in a little more than 85 solar years, the rule is to omit every 86th name. Now the double dates which I have given above show that, from the year 156 to 209 of the Gupta era, there was no name of the Jovian Cycle omitted. As this fact seemed to me to offer a ready means of obtaining an approximate date for the beginning of the Gupta-kâl, I drew up a Table showing the names of all the years of the 12-year cycle from the beginning of the Christian era down to the present day. Now as there was no omitted name between the years 156 and 209 of the Gupta era, or for a period of 54 years, the first date of Mahâ Vaisâkha, or Gupta-kâl 156, must lie within the period of 32 years (86 - 54) succeeding one of the omitted names. On referring to the General Table, where the names of the years of the 12-year cycle are all given, it will be seen that the date of 156 Gupta-kâl must, therefore, lie within some one of the following periods: - [Previous: c18.6](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c18.6) - [Next: c18.8](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c18.8) - [Up: c18](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c18) --- Source: [https://indike.org/pramana/ins.epigraphy.cunningham-1883.c18.7](https://indike.org/pramana/ins.epigraphy.cunningham-1883.c18.7) · Pramāṇa