A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 185
following figure. Let C be the center of the earth, P thepole, PC a portion of the earths axis. The plane PCB is the plane of onemeridian, and P CA the plane of anothermeridian. AB is a portion of the equator betweenthe two meridians. A CB is a sector inthe plane of the equator, and DEH andEGQ are… … the difference of lonq\ AB. Also, EG is departure corresponding to the same difference oflongitude AB. The difference of longitude is always greater thanany corresponding departure, that is, AB is obviously greater thanany oilier parallel distance between the same two meridians. PLANE SAILING. 183…
Surveying · Navigation
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