❖ An ancient observatory is found at the State’s first astro-archaeological site in Ellanthankarai, Sivagangai. 

❖ The huge burial site dating back to the megalithic period.

❖ This is the first astro-archaeological site in Tamil Nadu that reveals a clear observatory ground.

❖ This would then lead to a highly learned group called Tamil Arivargal who resided in the region.

❖ The earliest mention of these people is in the Tholkaappiyam.

❖ These people were well versed in astronomy.

❖ They would disseminate what they learnt to others and this form of learning was called Ainthiram, is also found in The Tholkaappiyam.