Detail of the hemispherical bowl-based sundial with marked marble slabs that map inverted image of sky and allows the observer to move inside the instrument. It measures altitudes, azimuths, hour angles and declinations. Jaipur, Rajasthan, India.
<a href="//commons.wikimedia.org/wiki/User:Argenberg" title="User:Argenberg">Vyacheslav Argenberg</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>