Nanakshahi calendar is a tropical solar calendar used in Sikhism.
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The reference epoch of the Nanakshahi calendar is the birth of Guru Nanak Dev, corresponding to the year 1469 CE.
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The Nanakshahi calendar was re-released in 2003 by the SGPC with three dates: Guru Nanak Dev Ji's Birth, Holla Mohalla, and Bandi Chhor Divas kept movable as per the old Bikrami system as a compromise.
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The Nanakshahi calendar was implemented during the SGPC presidency of Sikh scholar Prof.
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The Mool Nanakshahi Calendar recognizes the adoption event, of 1999 CE, in the Sikh history when SGPC released the first calendar with permanently fixed dates in the Tropical Calendar.
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Therefore, the calculations of this Nanakshahi calendar do not regress back from 1999 CE into the Bikrami era, and accurately fixes for all time in the future.
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However, the first date of the Nanakshahi calendar is based upon the Barah Maha of the Guru Granth Sahib, which has Chet as the first month.
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SGPC released a Nanakshahi calendar that was close to this one on the 300th year of Khalsa's Creation in 1999.
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