One half of the Samrat Yantra at Jantar Mantar, Jaipur (the largest astronomical observatory in the country). Its the tallest sun dial in the world. What makes it stands apart (and all the other astronomical instruments at the monument) is its accuracy. It tells the time that is accurate upto 2 seconds! Jantar Mantar, stands as an example of the Indian advancement and excellence in the science of mathematics, trigonometry, geometry, astronomy and astrology.
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