The Reform of the Yazdgerdi Calendar in the Year 375 Yazdgerdi According to Rivā Yat of Farnbag-SRō š

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DALVAND HAMIDREZA

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Journal: Iranian Journal for the History of Islamic Civilization Year:2021 | Volume:53 | Issue:2 Page(s): 399-417

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Title

The Reform of the Yazdgerdi Calendar in the Year 375 Yazdgerdi According to Rivā Yat of Farnbag-SRō š

Author(s)

DALVAND HAMIDREZA | Issue Writer Certificate

Keywords

History of scienceQ2

ZoroastrianismQ2

Iranian calendarQ1

Yazdgerdi calendarQ1

calendrical reformQ1

Abstract

The Yazdgerdi calendar is a part of the Iranian heritage which was accepted by the conquering Muslims in the same Sassanid way. They applied it to manage bureaucratic and financial affairs. The calendar, after two and a half centuries, encountered some inaccuracies. Hence, it was necessary to perform a calendrical reform to make it proper for administrative purposes. About 120 years after this reform, Zoroastrian society also found the calendar problematic for religious purposes Nowruz, as well as the end of the Iranian great cycle, was shifted more than a month from its original time. The leadership of the Zoroastrian community, based in Fars and Baghdad, implemented also reform to the calendar in the year 375 Yazdgerdi, despite the opposition of some traditionalist clerics of the north and east of Iran. In this paper, we study the historical evidence of this calendrical reform and its consequences in Zoroastrian sources and the works of Islamic astronomers.

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APA: Copy

DALVAND, HAMIDREZA. (2021). The Reform of the Yazdgerdi Calendar in the Year 375 Yazdgerdi According to Rivā Yat of Farnbag-SRō š. PAZHUHISHNAMEH TARIKH TAMADDON ISLAMI (MAQALAT WA BARRASIHA), 53(2 ), 399-417. SID. https://sid.ir/paper/386870/en

Vancouver: Copy

DALVAND HAMIDREZA. The Reform of the Yazdgerdi Calendar in the Year 375 Yazdgerdi According to Rivā Yat of Farnbag-SRō š. PAZHUHISHNAMEH TARIKH TAMADDON ISLAMI (MAQALAT WA BARRASIHA)[Internet]. 2021;53(2 ):399-417. Available from: https://sid.ir/paper/386870/en

IEEE: Copy

HAMIDREZA DALVAND, “The Reform of the Yazdgerdi Calendar in the Year 375 Yazdgerdi According to Rivā Yat of Farnbag-SRō š,” PAZHUHISHNAMEH TARIKH TAMADDON ISLAMI (MAQALAT WA BARRASIHA), vol. 53, no. 2 , pp. 399–417, 2021, [Online]. Available: https://sid.ir/paper/386870/en

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