Makar Sankranti: Marks the transition of the Sun into Makara rashi (Capricorn) on its celestial path, and the six-month Uttarayana period. The traditional Indian calendar is based on lunar positions, Sankranti is a solar event. The date of Makar Sankranti remains constant over a long term, 14 January.
Maha Vishuva Sankranti: Also known as Mesha Sankranti and Pana Sankranti, is celebrated as the Oriya New Year and is marked as the end of a Bengali year. The day marks the beginning of the New Year in the traditional Hindu Solar Calendar. On this day, the sun enters the sidereal Aries, or Mesha rashi. It generally falls on 14/15 April. This day is also celebrated as Vaisakhi in large parts of India, as a day of new beginnings (New Year). It also marks the foundation of the Khalsa Panth.
Dhanu Sankranti: celebrated on the first day of lunar Pausha month.  In Southern Bhutan and Nepal it is celebrated by eating wild potatoes (tarul)