Makar Sankranti is a mid-winter Hindu festival of India and Nepal. The festival is celebrated to mark the transition of the Sun from Sagittarius to Capricorn during the winter solstice in the northern hemisphere (or the beginning of Uttarayana). The famous Kumbh Mela is also held on Makar Sankranti every 12 years. Hindus gather in large numbers to take a holy dip at Ganga Sagar on this day every year. Watch this video to know what is Surya Uttarayan during Makar Sankranti!