A compendium of spherical astronomy with its applications to the determination and reduction of positions of the fixed stars (1906)
Newcomb, Simon, 1835-1909 · New York, The Macmillan company; London, Macmillan and co., ltd. · leaf 353
t axis. The 332 THE POSITIONS OF STAES [§ 176. plane of the circle is parallel to the tube of the telescope, and in.the plane of the meridian. At the eye end, in the focus, is ahorizontal spider line, at right angles to the vertical line overwhich transits are observed. The result of these rigid… … Fig. 36. The circumference of the circle is divided into 360 parts^of one degree each by fine lines or graduations, and each ofthese is subdivided into equal parts, generally 2 or 5 each. Thegraduations are numbered from 0° to 360°, and are visiblethrough at least one pair of microscopes at…
Spherical astronomy · Stars
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