The Astronomical Observatories of Jai Singh c9.11
The Astronomical Observatories of Jai Singh c9.11
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c9.11
The shape of the gnomon is generally a parallel trapezium, as in figure 34, ABB'C. In the same figure GE represents the position of the quadrants as they enter the gnomon, HG = FE is the radius, and the lines radiating from E and G show the construction of the scales of tangents on the edge AB.