Vishu is the astronomical New Year festival celebrated in Kerala, marking new beginnings and the equinox, with traditions such as viewing the auspicious 'vishukanni'. The festival, observed on the first day of the Malayalam month Medam (around April 14), involves rituals like vishukaineetam (gifts from elders), an elaborate feast (vishu sadya), and firecrackers (vishu padakkam). With roots tracing back to 844 AD, it incorporates various customs and celebrations across Indian regions under different names.