Onam is a Hindu festival celebrated by the people of Kerala. Onam is Malayali festival which is celebrated by native speakers of Malayalam. Onam day is decided based on Solar Calendar. Onam is celebrated inChingam month on Malayalam Solar Calendar. Chingam month is known as Simha month in other solar calendars and Avani month in Tamil Calendar. The day when Nakshatra Thiruvonam prevails in month of Chingam is considered for Onam celebrations.
The celebrations of Onam start on Atham day (the day when Atham Nakshatra prevails) and continue for 10 days till Thiruvonam day.Homes are spic and span, finishedpookalams are elaborate, new clothes are worn, and families gather to enjoy an elaborate vegetarian feast known as the Onam Sadya or Onasadya.