The most striking instrument in the Jantar Mantar, the astronomical observatory built in the 18th century and now a Unesco World heritage site, is the ‘Brihat Samrat Yantra’ which is supposedly the largest sundial in the world.

The most striking instrument in the Jantar Mantar, the astronomical observatory built in the 18th century and now a Unesco World heritage site, is the 'Brihat Samrat Yantra'  which is supposedly the largest sundial in the world.
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