گاهشماری جشن‌های زردشتی فارسی 1400

The most practical way to know the chronology of a nation is, naturally, to study the national religious occasions of that nation or nation. In the present work, Mary Boyce uses the occasions and positions of Iranian, Zoroastrian festivals, especially the seven obligatory festivals, which include the six Gahanbars and Nowruz Koshideh. is to describe the development process of Zoroastrian chronology. He begins his discussions with the history of prehistoric human chronology, he deals with ancient Iran and traces the evolution of Iranian chronology and Zoroastrian celebrations until the Islamic period. Then, in confirmation of his statements, he adds evidence of modern customs and traditions of Zoroastrians in Iran and India to his topics.