Answers

2014-11-12T21:04:16+05:30
Jantar mantar is a collection of architectural astronomical instrument build by  sawai jai sing who was a rajput king 
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2014-11-12T21:20:39+05:30
the jantar mantar has many instruments inside it.some are for measuring time of day and night and some were used to find out that how is the day going to of a person according to his or her zodiac signs.
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