A. Pandit Vidyadhar Bhattacharya was consulted by Sawai Jai Singh II of Jaipur when creating these enormous instruments.
B. The word Jantar Mantar, which in Sanskrit signifies instruments and formulas, has been corrupted.
C. His measurements of the equinoxes' precession and the ecliptic's obliquity are his two most important contributions to astronomy.
D. Samrat Yantra, Ram Yantra, and Jai Prakash were his original creations.