Mesha Sankranti (also called Mesha Sankramana) is a Hindu festival and refers to the day when the sun enters the Zodiac sign of Mesha (Aries). The day represents the vernal (Spring) equinox which occurs around 21 March but the day is marked in April.The day is important in solar and lunisolar calendars followed on the subcontinent. Mesha Sankranti is a solar event and generally falls on 13 April but sometimes also falls on 14 April according to the Gregorian calendar. A number of festivals are celebrated on this day.

Many regional calendars have two elements: lunar and solar. The lunar element is based on the movement of the moon and counts each month from either new moon to new moon, full moon to full moon,or the day after the full moon to the next full moon.The lunar element forms the basis of religious calendars and begin the year in Chaitra.Many regions begin the local new year with the commencement of the lunar calendar: Gudi Padwa in Maharashtra; Cheti Chand for the Sindhi community; and Navreh in Kashmir.In Gujarat, the regional year commences with the lunar month of Kartika after Diwali.

The solar element of lunisolar calendars begin the year in Vaisakha on Mesha Sankranti hence why the day is also called Vaisakha Sankranti. This day is observed by people across India, even in regions which begin the new year using the lunar calendar. However, some regions also begin the regional new year on Mesha Sankranti.

Also known as Vaisakha Sankranti, Mesha Sankranti is observed by people to mark the solar new year irrespective of when the regional new year is observed. The festival is very important for Hindus. People bathe in waters and make pilgrimage to holy places such as Haridwar.In Bihar, the day is celebrated as Satuan which involves people bathing and then eating sattu and jaggery. The sun god is also worshipped.