Gnomes, shadow indicators, are actually sundials. There are differences between the 14 gnomes of the Jantar Mantar in their function, but not in principle. With a sighting stick that rests against the quadrant and the ramp a celestial body is aimed at. At the bearing points of the sighting stick position data can be read from engraved markings. Depending on the orientation of the ramp to a point over the horizont, to the Celestial Pole or the Ecliptic Pole one can read position data corresponding to the horizont, equator or ecliptic system. Additionally time can be read from the ramp's shadow.