Bengali calendar
The Saka Era was the widely used in Bengal, prior to the arrival of Muslim rule in the region, according to various epigraphical evidence.
[12] Jyotisha, one of the six ancient Vedangas,[13][14] was the Vedic era field of tracking and predicting the movements of astronomical bodies in order to keep time.
[13][14][15] The ancient Indian culture developed a sophisticated time keeping methodology and calendars for Vedic rituals.
[17][18] Hindu scholars attempted to keep time by observing and calculating the cycles of the Sun (Surya), Moon, and the planets.
[19] The current Bengali calendar in use by Bengali people in the Indian states such as West Bengal, Tripura, Assam and Jharkhand is based on the Sanskrit text Surya Siddhanta and includes the modifications introduced during the reign of Shashanka, the first independent ruler of Gauda.
[1] During the Mughal rule, land taxes were collected from Bengali people according to the Islamic Hijri calendar.
The current Bengali calendar owes its origin in Bengal to the rule of Mughal Emperor Akbar who adopted it to time the tax year to the harvest.
[22][8][9][24] Shamsuzzaman Khan wrote, "that it is called Bangla san or saal, which are Arabic and Parsee words respectively, suggests that it was introduced by a Muslim king or sultan.
[26] The current Bengali calendar in the Indian states is based on the Sanskrit text Surya Siddhanta.
In Dhaka, the cultural organization Chhayanaut hosts a notable concert in Ramna Park, starting at dawn on 14 April.
The Mangal Shobhajatra parades are brought out in many Bangladeshi cities during the festival and is regarded by UNESCO as an intangible cultural heritage.
[citation needed] The Bengali New Year's Day is a national holiday in Bangladesh and Indian state of West Bengal, observed on 14 and 15 April on each region, respectively.
[citation needed] Traders start a new Haal Khata book on Pohela Boishakh to keep financial records and settle debts.
[29] Pohela Falgun and Basanta Utsab is the first day of spring in the Bengali calendar celebrated in Bangladesh and India, respectively.
[citation needed] In the Chittagong region of Bangladesh, the Boli khela wrestling matches are organized during the month of Boishakh.
