ईश्वराय नमस्तुभ्यं तत्पुरुषाय वै नमः Vedshala is located at Ujjain. It is referred as amongst the most significant sundial and yantras to estimate time and observe planetary positions. Also, According to the Surya Siddhanta, one of many earliest readily available texts on Indian astronomy courting back towards the 4th century, https://garrettozgkn.bloggosite.com/32934009/the-2-minute-rule-for-mahakal