“Shastra [sacred Vedic texts] can foretell what will happen millions and millions of years in the future.”
This is from the Srimad-Bhagavatam 8.13.11
[This chapter of the Srimad-Bhagavatam is entitled, “Description of Future Manus.” The Manus are highly placed officials entrusted with the government of the universe. The total duration of the periods ruled by the Manus named in this chapter is calculated to be one thousand catur-yugas, or 4,300,000 times 1,000 years.]
O King, when the period of the eighth Manu arrives, Savarni will become the Manu. Nirmoka and Virajaska will be among his sons.
The present reign is that of Vaivasvata Manu. According to astronomical calculations, we are now in the twenty-eighth yuga of Vaivasvata Manu. Each Manu lives for seventy-one yugas, and fourteen such Manus rule in one day of Lord Brahma.
We are now in the period of Vaivasvata Manu, the seventh Manu, and the eighth Manu will come into existence after many millions of years. But Sukadeva Gosvami, having heard from authorities, foretells that the eighth Manu will be Savarni and that Nirmoka and Virajaska will be among his sons. Shastra [sacred Vedic texts] can foretell what will happen millions and millions of years in the future.