(Dhruva: Pole Star, Karshala Pattika: viewing plate)
The Dhruvdarshak Pattika is perhaps the simplest of all the instruments found in the Observatory. It is in the form of a small trapezoidal structure whose upper surface point towards the Pole Star on a clear dark night.
The angle in the triangular wall is supposed to be equal to the latitude of the Observatory’s location (27 degrees North). The instrument is erected on a 3.07m long and 54cm wide stone masonry base. Its lower end is about 76 cm above the ground and the upper end, 2.32m.
This instrument was the compass of an earlier age.