<p>The <b><big>Jaya Prakâsh Yantra</big></b>, allowed to identify, during a full hour of observation, a star in the southern sky, using a small copper disk placed in the center of the hemisphere. 
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<a href="//commons.wikimedia.org/wiki/User:Dvillafruela" class="mw-redirect" title="User:Dvillafruela">Daniel Villafruela</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>