Friends,

Literature dating has to be done along with lot of other details as Archeology, Visitors from Abroad notes etc.,

Astrology and Astronomical based on earlier are just Speculative, and Tholkappiyam with its Eluthu Ilakanam is perfectly verifed with Brahmi Inscriptions which match to Later Part and hence closed to 150-100BCE.

Again Datings must be done by Scholars and verify various University on Encyclopedia websites, Unbiased.

Anchaneya.