Jantar Mantar, Jaipur

Maharaja Sawai Jai Singh II had intense propensity to work with celestial bodies, therefore, he built five observatories in Delhi, Jaipur and other cities of India. Amongst those five observatories of Sawai Jai Singh II, the Jantar Mantar, Jaipur is biggest and it houses a number of instruments related to solar observations.

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http://jantarmantarofjaipur.blogspot.com/2007/07/astronomical-wonder.html