Jaipur, Rajasthan, India. Jantar Mantar Is Astronomical Observation Site Built In Early 18th Century. It Includes Set Of Some 20 Main Fixed Instruments. Jantar Mantar Literally Means Calculating Instrument. Close-up View On Yantra Raj Yantra Bronze Astrolabe, One Of Largest In World, Used Only Once Year, Calculates Hindu Calendar.
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