List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 30
GURE AND MAGNITUDE OF THEEARTH. A spectator at sea, or in a level country, mayimagine himself in a flat plane, extending itself inall directions from him, and bounded by the circleof the horizon, which separates the sky from thesea or land. But a little attention will soon convince him thatthe… … For, at sea, the first part of a distant ship that is visible is the top of her masts; then, more and more of her masts is seen, and gradually the hull. On land, also, we observe the tops of distant ob- 3 (25) 26 OUTLINES OF ASTRONOMY. jects, when the lower parts are invisible, as wemay…
Astronomy
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