<p><b><big>Brihat Samrat Yantra</big></b> is a large sudial allowing it to measure the local time with a resolution of  0.5 s. And you have to climb to read time! 
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<a href="//commons.wikimedia.org/wiki/User:Daniel_VILLAFRUELA" title="User:Daniel VILLAFRUELA"> Daniel VILLAFRUELA</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>