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Sankranti (Sanskrit: सङ्क्रान्ति, romanized: Saṁkrānti) refers to the transmigration of the sun from one zodiac to another in Indian astronomy.
Each Sankranti is marked as the beginning of a month in the sidereal solar calendars followed in Andhra Pradesh, Uttarakhand, Tamil Nadu, Kerala, Karnataka, Punjab, Odisha, Mithila region of Bihar and Nepal. On the other hand, in the sidereal solar Bengali calendar and Assamese calendar, a Sankranti is marked as the end of each month and the day following as the beginning of a new month.
Dhanu Sankranti is celebrated on the first day of lunar Pousha month.