Explanation: Jantar Mantar is a series of five astronomical observatories built by Maharaja Jai Singh II of Jaipur in the early 18th century. These observatories are significant for their unique architectural design and historical importance in Indian astronomy. The observatories are located in Jaipur, Delhi, Ujjain, Mathura, and Varanasi. Each observatory contains a variety of large-scale instruments designed for astronomical observations, such as the Samrat Yantra, which is a giant sundial used to measure time and the position of celestial bodies.
Maharaja Jai Singh II was a keen astronomer and mathematician who sought to improve the accuracy of astronomical predictions and observations. He built these observatories to study celestial bodies and predict astronomical events, which were crucial for religious and agricultural purposes in India. The observatories are not only important for their scientific contributions but also for their architectural and cultural significance.
The observatories in Jaipur and Delhi are the most well-known and visited, but the ones in Ujjain, Mathura, and Varanasi are equally significant. Ujjain, located in Madhya Pradesh, has an observatory that was particularly important for studying the movements of the planets. Mathura, in Uttar Pradesh, and Varanasi, also in Uttar Pradesh, have observatories that were used for similar purposes.
It is important to note that the locations of Jantar Mantar observatories are specific and not interchangeable with other historical sites in India. The cities mentioned in the correct answer, Ujjain, Mathura, and Varanasi, are the only other locations besides Jaipur and Delhi where these observatories are found. This makes them unique and important sites for understanding the history of astronomy in India.
In summary, the correct answer is C) Ujjain, Mathura & Varanasi, as these are the cities where the Jantar Mantar observatories are located, along with Jaipur and Delhi. Understanding the locations and significance of these observatories is crucial for anyone studying Indian history, astronomy, and cultural heritage.