What is the name of the festival celebrated by farmers in Bihar to mark the beginning of the agricultural season?

The festival celebrated by farmers in Bihar to mark the beginning of the agricultural season is called "Makar Sankranti" or "Sankranti." It's a harvest festival celebrated in various parts of India under different names, marking the transition of the Sun into the zodiac sign of Makara (Capricorn). In Bihar, it's often referred to as "Khichdi" or "Til Sankranti."