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Sumrat yantra sundial, India

Sumrat yantra sundial, India

R100/0186

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Credit

SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY

Caption

Sumrat yantra. Shadow being cast over the Sumrat yantra sundial at the Jantar Mantar observatory, Jaipur, India. This structure is the largest sundial in the world. It consists of a ramp (gnomon) facing north and two marble-faced quadrants on either side (one visible at left). The ramp is elevated at an angle of 27 degrees above the northern horizon. This is the latitude of Jaipur, making the front of the ramp point towards the celestial north pole (top). The movement of the Sun casts a shadow over the quadrants, and the local time is read from markings inscribed in the marble. The observatory was constructed by Maharaja Jai Singh II between 1727 and 1734.

Release details

Model release not required. Property release not required.

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