An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 59
hus the law of increasein refraction as we proceed from the zenith towards the horizon,might be ascertained. 91. Another method of finding the refraction at different alti-tudes, is as follows. Take the altitude of the sun or a star, whoseright ascension and declination are known, and note the time… … co-latitude and Pa: the co-declination. Hence we can find the coaltitude Zx, and of course the true altitude. Compare the alti-tude thus found with that before determined by observation, andthe difference will be the refraction due to the apparent altitude. * For the polar distance of the…
Astronomy
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