The Jantar Mantar was the largest of the five Astronomical Observatories built by Jai Singh. The Samrat Yantra is the world's largest sundial, standing 27 meters (73 feet) high.
The Jantar Mantar was an Astronomical Observatory and not an astrological one. This marker locates the great Samrat Yantra at the Jaipur Jantar Mantar.
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