The instrument has a construction like Russian doll one into other.
In the middle of the instrument there is pillar, about one meter in height. While
the second circular wall is just like a ring, which has a same height as that of a pillar.
The outermost circle has two metres height, and eight metres in diameter.
On the horizons of all
these circles graduated marble slabs from 0 degree to 360 degree are placed. They are even
sub-divided in terms of decimal etc. Two copper wires are tightly streched ascross the
exterior wall, from 0
to 360 degree are placed. They are even sub-divided in terms of decimal etc. Two copper
wires are tightly streched ascross the exterior wall, from 0 degree to 180 degree and 90
degree to 360 degree, to represent the North-south and East-West directions respectively.
At the center a metallic ring is tied, supported by these two strings.
To determine the azimuth of
the sun, for which this is most accurate instrument, we take a thread and fix it from the
knob of the innermost pillar's center. As the sun rises higher, the shadow of the circular
metallic ring enchants its shadow on the second circular ring. We take this thread unto
the outhermost circular wall's graduatio, through the enchanted shadow of the ring. Thus
the reading of the horizon on the third wall is the azimuth of the sun. And thus we can
further calculate the sun's rising and setting time and weather forecasts.