Jantar mantar is the worlds largest sundial colckThe Jantar Mantar monument in Jaipur, Rajasthan is a collection of nineteen architectural astronomical instruments, built by the Rajput king Sawai Jai Singh II, and completed in 1734.[1][2] It features the world's largest stone sundial, and is a UNESCO World Heritage site.
It was located in jaipur (india) jantar mantar is telling the perfect time for almost 300! Years its really too much...
THE JANTAR MANTAR is telling the time with the movement of sun and there is a building so the shadow of building was in the clock so they calculate the perfect time 
And the most intresting part of this clock is that in this big clock u can easily see the movement of sun in every second this clock is also showing the seconds
So its really impressive...
And its not over in this place many types of hystorical devices r there ..
And they r telling about stars and astrology.....
And i think u all r think that what is the meaning of jantar mantar so the meaning is = calculating instrument...
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Originalworks
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Nice photos
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