Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 22
th upon that day. It will appear at once that the arcs between the successive pointsare of nearly equal length if tKe times of observation were equi-distant, and otherwise are proportional to the intervals of time THE DIURNAL MOTION OF THE SUN 9 between the corresponding observations — a property… … stiff paper or cardboard may be held edgewise between the hemi-sphere and the eye, so as to cover all the points; that is, they alllie in the same plane. This fact shows that the suns path is acircle on the sphere. It is shown by the principles of solid geometrythat all sections of the sphere by a…
Astronomy
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