The cord is called Khait and is used as a plumb line when measuring celestial altitudes.
2.
The larger half of it has a dark blue color, which one symbolizes a celestial altitude and advantage.
3.
That is, one set of numbers begins at the left end of the arc and goes to 90 at the right end while the other set the zero is at the right and the 90 is at the left . This double numbering enables the instrument to measure either celestial altitude or zenith distance or both simultaneously.
मोबाइल