Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 53
across the field,the observer, by means of aslow movement of the tele-scope, places the wire c dimmediately over the star sothat, in consequence of thediurnal motion, the star ap-pears to run behind the wire. The observer alsotakes the transits across the five vertical wires in theway already… … Observation of the Nadir. 3 5 reading of the circle is not sufficient to define the posi-tion of the star; we must now obtain a second readingwith the telescope in a definite position. Thus, sup-pose in fig. 13 the direction in which the telescopewas pointed was c t, then, if we were able to turn…
Astronomy
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