Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 144
ich the suns altitude isthe same at all points. A short portion of such a circlemay be considered as a straight line and can be deter-mined by locating one point and its direction, or twopoints in it. This is known as a Sumner line. (Fig. 39.) From an observation of the suns altitude and azi-muth… … *m^w
Nautical charts
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