Explanations:Jantar Mantar is a significant historical and scientific site located in Jaipur, Rajasthan, India. It was constructed by Maharaja Jai Singh II in the early 18th century as an astronomical observatory. The term "Jantar Mantar" translates to "Calculating Instrument" in Hindi, reflecting its primary purpose of aiding in astronomical calculations and observations.
The observatory consists of 19 large-scale, fixed instruments, each designed to perform specific astronomical functions. These instruments were used to measure time, predict eclipses, and track celestial bodies. The instruments are made of stone and metal, and their design is based on ancient Indian and Islamic astronomical principles. The most famous instruments include the Samrat Yantra, which is a large sundial used to measure time, and the Jai Prakash, which is a hemispherical sundial used to determine the position of celestial bodies.
The construction of Jantar Mantar was part of a larger effort by Maharaja Jai Singh II to establish observatories across India. He built similar observatories in other cities such as Delhi, Ujjain, and Varanasi. The observatories were designed to improve the accuracy of astronomical observations and to support the development of Indian astronomy and timekeeping.
Understanding the historical and scientific significance of Jantar Mantar is crucial for students preparing for competitive examinations. The observatory not only represents a significant achievement in Indian science and technology but also serves as a testament to the cultural and intellectual heritage of Rajasthan. The correct answer to the question is that Jantar Mantar means "Calculating instrument" and it has 19 instruments, as stated in option B.