Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 322
, O the centre of the earth,A and B two places on the same parallel AB, PAE and PBQmeridians through A and B intercepting EQ on the equator.Let AD and BD be perpendicular to PO. Draw AO. AB isthe departure, or meridian distance Begard the earth asspherical. PARALLEL SAILING 333 AE = BQ = EGA = GAD… … Fig. 14
Trigonometry · Surveying · Navigation
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