1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
ASTROLABE (from Gr. oxnpov, star, and \afitiv, to take), an instrument used not only for stellar, but for solar and lunar Altitude-taking. The principle of the astrolabe is explained in tig. 2. There were two kinds, — spherical and planispheric. Fis. 2.— Principle of the Astrolabe. If a solid circle be fixed in any one position and a tube be pivoted on its centre so as to move; and if the line C D be drawn upon the circle pointing towards any object Q in the heavens whi.-li lies in the plane of the circle, by turni…
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- Vol. 2, pp. 795-795