Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 81
crometer wire, andthe micrometer is read. The instrument is then turned 180° inazimuth, and the process is repeated with the second star. Thedifference of the zenith distances is then obtained from the dif-ference of the two micrometer readings, and added to the halfsum of the two declinations,… … jection of the celestial sphere on the planeof the horizon. Z is the zenith of the place,P the elevated pole, PZ the co-latitude, andS a star, whose altitude is measured. SPZis the hour angle of the star, which can beobtained from the local time noted at theinstant the altitude is observed. PS is…
Astronomy
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