Vira Nirvana Samvat
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The Vira Nirvana Samvat (era) originated on 15 October 527 BCE. It commemorates the nirvana of Mahavira, the 24th Jain Tirthankara. This is the oldest system of chronological reckoning which is still used in India.
The Jain calendar (Panchäng) is a “Lunisolar” calendar. It is based on the position of the Moon with respect to the Earth and it is adjusted by adding an extra month once every three years, to coincide with the SUN to bring month in phase with the season. Its day or date which is known as Tithi, indicates the moon phase and the month indicates the approximate season of the solar year.
The lunisolar calendar has the following arrangement: A regular or normal year has 12 months; a leap year has 13 months. A regular or normal year has 353, 354, or 355 days; a leap year has 383, 384, or 385 days.
The average number of days in a month is 30 but the average number of days in a Lunisolar year is 354 and not 360 (12 months in a year) because it takes the Moon about 29.5 days (not 30 days) to complete the circle around the Earth. Hence one Tithi is eliminated in about duration of two months. The Jewish (Hebrew), Hindu lunar, Buddhist, and Tibetan calendars are all lunisolar, and so were the Japanese calendars until 1873 and the Chinese calendars until 1912.
The Islamic calendar is a pure Lunar Calendar because its date (Tithi) indicates the moon phase but its months are not in phase with the time of the solar year or the season. It does not adjust its calendar to coincide with the sun or the season. Hence no extra month is added every three years.
The Jain year Vira Nirvana Samvat is obtained by adding 470 years to the Kartikadi Vikram. The Vira Nirvana Samvat 2532 started right after Diwali of 2005.
The Jain year starts with Diwali. So, Vira Nirvana Samvat 2534 starts with Diwali 2007. The Jain business people traditionally started their accounting year from Diwali. The relationship between the Vir and Shaka era is given in Titthogali Painnaya and Dhavalaa by Acharya Virasena:
पंच य मासा पंच य वास छच्चेव होन्ति वाससया|
परिणिव्वुअस्स अरिहितो तो उप्पन्नो सगो राया||
Thus the Nirvana occurred 605 years and 5 months before the Saka era.
On 21 October 1974 the 2500th Nirvana Mahotsava was celebrated by the Jains throughout India.
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