Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 49
c, D, is the axis ofthe instrument pointed to the pole of the heavens ;E, B, c, the circle placed North and South representingthe meridian ; R, Q, N, the circle placed at right angles 26 STARGAZING ; JAST AND JRESENT. [book r. to the polar axis, representing the equator, but in theinstrument of… … Fiu. 8.—Astrolabe (Armillfe Aequatoiite of Tyeho Brahe) similar to the ouecontrived by Hipparchus. dian. Thus, then, if the altitude of a star from theequator (or its declination) was required to be observed,the circle was turned round on the axis, and thesights, Q, M, moved on the circle till…
Astronomy · Telescopes
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