The origin of Tabari calendar coincides with the 2nd of Amordad in the solar calendar; it in turn coincides with the reign of King Qubad of Sassanid and the rule of his son King Kavoos who reigned the Satrap of Tabarestan. The people of Tabarestan, in an effort to solve the problem of leap year, established a leap day called Sheshek, which is considered as the modern origin of the Tabari calendar.
It should be noted that the history of using the Tabari calendar in Greater Tabarestan dates back to hundreds of years before the mentioned date. The original calendar which consisted of 12 months of thirty five days did not belong to any of the months of the year and was called Petek. Due to the fact that the leap year was not considered as an extra day at first, Tabari year was almost one day ahead of the solar year after every four years. This had, after many years, caused disorder and disruption, especially for farmers dealt with different seasons of the year.
To solve this problem, one day was added to the beginning of the five days, Petek, and the six days that did not belong to any of the twelve months were called Sheshek.
The Office of International and Scientific Cooperation of University of Mazandaran congratulates the arrival of the Tabari New Year to the Tabari people all over the world and wishes them a year full of happiness and health.
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