A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 205
tal parallaxis given in the Nautical Almanac forevery noon and midnight of Green-wich time, and from the horizontalparallax we must deduce the paral-lax corresponding to any otheraltitude. Let AC be the radius of theearth, A the position of an observer,Z his zenith, and suppose H to be the moon in… … * From this figure we draw the following definition for horizontal parallax. The horizontal parallax of any body is the angle under ichichthe semi-diameter ofthe earth would appear as seen from that body. Of course then, when the body isat a great distance its horizontal parallax must be small,…
Surveying · Navigation
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