Samrat Yantra, an equinoctial dial, consisting of a triangular gnomon with the hypotenuse parallel to the earth's axis. Also seen on either side of the gnomon is a quadrant of a circle parallel to the plane of the equator. Further away is the Ram Yantra, one of two circular structures used for calculating the horizontal (azimuth) and vertical (altitude) angles of heavenly bodies.
Jantar Mantar, Delhi, early 19th century.
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