Malayalam New Year (Puthuvarsham) is celebrated either on the 1st day of the month of Medam in mid-April which is known as Vishu or the 1st day of the month of Chingam,in the Malayalam Calendar in mid-August according to another reckoning. Unlike most other calendar systems in India, the New Year's Day on the Malayalam Calendar is not based on any astronomical event. It is just the first day of the first of the twelve months on the Malayalam Calendar. The Malayalam Calendar (called Kollavarsham) originated in 825 CE, based on general agreement among scholars, with the re-opening of the city of Kollam (on Malabar Coast), which had been destroyed by a natural disaster.