The ۳۳۸-Year A.H.(Solar) and ۱۶۹-Year A.D. (Christian) Calendars

چکیده مقاله

Chronology is a science of time measurment in terms of dates, days, months and years. Chronology has a historical background of well over ten thousand years. It involves the most important problem of firillg the commencing date of a calendar. In order to estimate periods of time. It is necessary to detemine starting date of the successive turms of the year.

Next in importance is to apply units of time-periods for scientific measurment of actual passage of time in relation to the starting date of a calendar. For the purpose of fixing the commencement date a major historical event is taken into consideration.

The Christian or A.D. Calendar begins from the date of birth of Jesus Christ (May Gods peace be upon him). Islamic Hijri Calendar starts from the date of migration of the Holy Prophet Muhammad (May Allah Peace and Benediction be upon him) from Makkah to Madina. The Islamic Calendar is named Hijri Calendar, which had its Solar and Lunar versions.

At present, Iranian, Islamic and Christian Calendars are available for obtaining whatever dates, days, months and years one may require from the calendars.

The writer of this article presents conversion tables prepared according to the relevant rules and formulas of Chronology based on the successive turms of the year and its months. The tables make it possible to obtain corresponding dates or days among the Hijri (Solar), and A.D. Calendars over a period of 169 years in the case of A.D. Calendar and 338 years for A.H. (Solar) Calendar.