Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 107
le instrument as one massabout the polar axis until the telescope points to any por-tion of the parallel of declination defined by the givenright ascension or hour-angle. Fig. 37 is an equatorial ofsix-inch aperture which can be moved from place to place. If we point such a telescope to a star when… … Fig. 37.—equatorial telescope pointed toward the pole. THE MICROMETER. 89 whole apparatus on the polar axis, cause the telescope totrace out on the celestial sphere the apparent diurnal pathwhich this star will appear to follow from rising to set-ting. In such telescopes a driving-clock is so…
Astronomy
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