Keywords: Samrat Yantra, Jantar Mantar, Delhi, early 19th century.jpg en 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 http //www bl uk/onlinegallery/onlineex/apac/other/019xzz000004325u00020000 html British Library Creator Thomas Daniell Creator William Daniell early 19th century PD-old PD-old-100 Jantar Mantar Delhi Thomas Daniell William Daniell Delhi in the 1800s 1800s paintings from India |