Bihu Bihu from the Sanskrit Vishu, is the harvest festival of Assam and is celebrated thrice in a year. The festival at the beginning of the spring season is Bohag Bihu, associated with the Vernal equinox in Chaitra Sankranti. The Kati Bihu is associated with the Autumnal equinox in Ashwina Sankranti. ... The Magh Bihu or Bhogali Bihu associated with the winter solstice is celebrated with food and drinks after harvest, in Pausa Sankranti. http://www.experiencefestival.com/chaitra_sankranti 3 Harvests Bohag Bihu, Kati Bihu, Magh Bihu Chaitra Sankranti, Ashwina Sankrnati, Pausa Sanskranti Spring Equinox, Autumn Equinox, Winter Equinox