Figure 93
Diagrammatic representation of the north-south line on a sphere (top right), a ecliptical-equatorial instrument based on the same principles (top left), and an illustration of the corrected north-south line (bottom)
Figure 93
Diagrammatic representation of the north-south line on a sphere (top right), a ecliptical-equatorial instrument based on the same principles (top left), and an illustration of the corrected north-south line (bottom)