Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 17
e earths surface, and let Abe the position of the observers eye: it is at once evident thatno portion of the ship, S, will be visible which is situated belowthe line AHy drawn from A tangent to the earths surface at C.The same figure also shows why it is that when a ship is ap-proaching land any… … DIURNAL MOTION. 13 earth is spherical in form; for if, in Fig. 1, the line AH iiturned about the point A, and is continually tangent to thesphere, the points of tangency, C, D, E, &c, will form the visiblehorizon of the spectator, and will evidently constitute a circle. (3.) A lunar eclipse…
Astronomy
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