Introduction and Development of the 128 Years Cycle in the Solar Hejira Calendar
The problem of the determination of the leap years in the solar Hejira calendar has been discussed and investigated since 1890. For this purpose, several cycles of 128, 161, 2820 and 4166 years have been introduced. Among them, the 128 years cycle is the most widespread one, both singly or in combination with other cycles (or sub-cyles). A history of the contribution of different scholars on this topic is presented in this article.
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