- 13th Thiruppavai appears to give a rare astonomical data.
It appears to have occured
(1) on 27.11.600 - 330 am. Since Aandal sings of twilight (Keezhvanam vellendru .. this was negatived)
(2) in 885 AD .. morning around 715 am .. negatived.
(3) 18.12.731 AD - 5 am !!~
applying being bith details of Aandal - NALA - tamil month Aadi - pooram star - tuesday falling in 716 AD, Aandal is likely to be of 15 year old in 731 AD December - when hymned Thiruppavai !!