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Jain calendar

The Vira Nirvana Samvat (era) is a calendar era beginning on 15 October 527 BCE. It commemorates the nirvana of Mahavira, the 24th Jain Tirthankara. This is one of the oldest system of chronological reckoning which is still used in India.

The earliest text to mention 527 BCE as the year of Mahavira's nirvana is Yati-Vrishabha's Tiloya-Pannatti (5th century CE). Subsequent works such as Jinasena's Harivamśa (783 CE) mention the Vira Nirvana era, and give the difference between it and the Shaka era (beginning in 78 CE) as 605 years and 5 months.

The Jain calendar (Panchāng) 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 Hebrew, Hindu lunar, Buddhist, and Tibetan calendars are all lunisolar, and so were the Japanese calendars until 1873 and the Chinese calendars until 1912.


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