Archaeoastronomy and Vedic chronology
The history of Indian astronomy begins with the Vedic period, Lagadha and composition of Vedanga Jyotisha (1400 BCE - 1200 BCE). Astronomical knowledge in India reached an early peak in the 5th century CE, with the Āryabhaṭīya.
Source: Wikipedia — Archaeoastronomy and Vedic chronology (CC BY-SA 4.0)