Above: Based in Jaipur, India, and built in 1727 and 1734, the Jantar Mantar is an incredible astronomical observatory comprising of various instruments, all carved from stone. The most prominent of these is the Santra Yantra (Supreme Instrument), an enormous sloped construction which, at a height of 73ft, is the world's largest sundial and a device which enables the viewer to tell the time to an accuracy of approximately two seconds. The shadow cast by the sundial moves at a rate of 1mm per second.
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