Celestial scenery, or, The Wonders of the planetary system displayed : illustrating the perfections of deity and a plurality of worlds (1845)
Dick, Thomas, 1774-1857, Parker, E. S., former owner. DSI, David H. DeVorkin Collection (Smithsonian Institution. Libraries) DSI · Philadelphia : Published by Edward C. Biddle · leaf 302
oon from the earth. In Fig. CIX. let E C representthe earth ; M the moon; E the place of a spectator observingthe moon in his sensible horizon ; E Mb and CMa the di-rection of the moon as seen from the centre of the earth at C,or from its surface at B; a the place of the moon as seenfrom the… … to be 57 minutes, 5 seconds. Here, then, we have a triangle,C E M, of which we have one side and two angles given.The side given is the semidiameter of the earth, E C, whichis equal to 3965 miles ; the angle at E is a right angle, orninety degrees, for it forms a tangent to the circle at E ;…
Astronomy
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