"Hence, examining astronomical references in Vahara Mihira and Vedanga Jyotish, we arrive at the equinoctial positions of about 1280 BC. This is found as the latest reference in later Vedic texts like the Brahmans, with the new Moon in Magha marking the winter solstice. Using the different points of Krittika as marking the vernal equinox and the lunar positions earlier in the month of Magha back to the eighth day of the waning Moon (Ekashtaka), we get a period of 2800-1760 BC. Vedic references show an ongoing adjustment of their solstice-oriented calendar, proving the existence of Vedic culture at this time along with the existence of a sophisticated system of astronomical observation."