Ongoing restoration work at a 12th-century Sun Temple near Mirzapur has uncovered a hidden subterranean level featuring a series of solar calibration chambers. These chambers were designed to funnel sunlight through precise stone apertures to hit specific points on an underground altar only during the equinoxes and solstices.
The architectural precision of these chambers suggests that Gahadavala dynasty engineers possessed advanced knowledge of spherical astronomy. The site served not only as a place of worship but also as an agricultural observatory, helping local Sanatan communities manage crop cycles through precise seasonal tracking.