Understanding the Amanta (Mukhyamana) Lunar System
The Amanta system (from Sanskrit Amā-anta, meaning "ending with the New Moon") is the traditional method of reckoning lunar months where each month concludes at the moment of Amavasya (conjunction of the Sun and Moon). The new month commences immediately thereafter on Shukla Paksha Pratipada.
Regional Dominance Across Southern and Western India
The Amanta framework is followed throughout Maharashtra, Gujarat, Karnataka, Andhra Pradesh, Telangana, Tamil Nadu, and Kerala. The regional New Year festivals of Gudi Padwa (Maharashtra) and Ugadi (Karnataka, Andhra Pradesh, Telangana) mark the commencement of the new Amanta year on the first day of Chaitra Shukla Paksha.
Why Does Diwali Fall at Month-End in the Amanta Calendar?
A frequent point of curiosity arises during major festivals like Diwali (Lakshmi Puja). In the Amanta calendar, Diwali falls on Ashwina Amavasya—the very last day of the month of Ashwina. The day following Diwali begins the brand-new month of Kartika, celebrated in Gujarat as Bestu Varas (New Year) and across India as Govardhan Puja. In contrast, North Indian Purnimanta calendars consider Diwali to occur in the middle of the month of Kartika.
Semi-Technical Mechanics: Elongation and Adhik Maas Insertion
A lunar month is defined by the Moon's elongation from the Sun from $0^\circ$ back to $360^\circ$ ($0^\circ$). Under classical Surya Siddhanta astronomy, when two consecutive New Moons occur within the same solar sign (without the Sun entering a new Rashi between them), an Adhik Maas (intercalary month) is inserted. In the Amanta system, the intercalary month is cleanly named by repeating the lunar month during which no solar transit (*Sankranti*) occurred.
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