List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 20
ther. The sensible hori-zon of course varies according to the elevation ofthe observer, while the rational horizon is unvary-ing. If the spectator directs his attention to the north,he will find that some stars, as the Pole Star, andthe stars of the Great Bear, never reach the hori-zon, but… … the direction of a line drawn through two of thestars of the Great Bear, called the Pointers. If the spectator, whom we may at first supposeto be placed on the northern half of the earth orhemisphere, be now removed to the southern hemi-sphere, similar appearances will present them-selves. The…
Astronomy
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