Recreations in astronomy : with directions for practical experiments and telescopic work (1879)
Warren, Henry White, 1831-1912 · New York : Harper & Brothers · leaf 80
n an axis, as in Fig. 21; point it horizontally at a star; USES OF ASTRONOMY. Gl turn it up perpendicular to another star. Of coursethe two stars are 00° apart, and the graduated scale,which is attached to the outer edge of the circle, showsa revolution of a quarter circle, or 90°. But a… … Fi_r. •-!.—Mural Circle. mensely more at the distance of the stars. The cor-rection of an inaccuracy of no greater magnitude thanthat has reduced our estimate of the distance <>f ourMm 3,000,000 miles. odder the nicety of the work. Suppose the grad-uate to be thirty feet in circumference.…
Astronomy
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