Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 45
y ~Jgiven star will be bisecteo by the horizontal spider-lineof the reticle at the momentwhen it crosses the meridian.The instrument carries alarge and carefully graduatedcircle so attached to the axisas to turn with the telescope. Two or more so-called reading micro-scopes fixed to the pier read… … Fig. 11. —The Meridian Circle (Schematic) 50. Refraction. — It was said that the observed altitudes must becorrected for atmospheric refraction. As the rays of light enter theearths atmosphere from a distant object they are bent downward byrefraction (Physics, page 295), except only such as strike…
Astronomy · Constellations
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