Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 42
e observations were made, the mean of these two reducedreadings will be the horizontal point. The horizontal pointhaving been thus determined, the zenith^oint and the nadir point,being situated at intervals of 90° from it, are at once obtained.Knowing the horizontal and the zenith point, we are… … 7D Fig. 10. pole, if the latitude of the place is accurately known, we can atonce obtain the polar point by applying the latitude to thehorizontal point. 31. Nadir Point.—The nadir point may oe independentlyobtained in the following manner. Let thetelescope, represented in Fig. 10 by AB>…
Astronomy
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