Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 46
noting the c orresponding times to anyextent that we choose; and the amoun t of refraction correspond-ing to each altitude can afterwards be computed at our leisure. THE EQUATORIAL. 38. The equatorial is similar in general construction to thealtitude and azimuth instrument. It is, however,… … EQUATORIAL OF HARVARD COLLEGE. EQUATORIAL. 41 name of equatorial. The circle C C> when thus placed, is calledthe hour circle of the instrument, and the axis J., at right anglesto it, is called the hour or polar axis. It is evident that the axisis directed towards the poles of the heavens. The…
Astronomy
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