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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1845 edition. Excerpt:...= 19 11'. Its azimuth from the North = 17 15'. 7. Find the altitude and azimuth of Fomalhaut to an observer at Boston, in the year 1840, when its hour angle is 6. Ans. Its depression below the horizon = 19D 58'. Its azimuth from the South = 66 30'. 8. Find the altitude and azimuth of Dubhe to an observer at Boston, in the year 1840, when its hour angle is 6. Ans. Its altitude.. =36 44'. Its azimuth from the North = 35 2'. 9. Find the altitude and azimuth of a star in the celestial equator to an observer at Stockholm, when its hour angle is 2 3TM 20'. Ans. Its altitude.. = 25 58'. Its azimuth from the South = 34 45'. 10. Find the altitude and azimuth of a star in the celes Altitude of a star in the prime vertical. tial equator, to an observer at Stockholm, when the hour angle is 9 30TM. Am. Its depression below the horizon = 23 51'. Its azimuth from the North = 41 45'. 11. Find the altitude and azimuth of Fomalhaut, to an observer at the equator, in the year 1840, when its hour angle is 2 3TM 20'. Ans. Its altitude... 47 45'. Its azimuth from the South = 41 4'. 12. Find the altitude and azimuth of Dubhe, to an observer at the equator, in the year 1840, when its hour angle is 9 30TM. Ans. Its depression below the horizon = 21 24'. Its azimuth from the North = 17 30'. 34. In the triangle ZPB (fig. 35) other parts might be given instead of the two sides ZP, PB, and the included angle P, and the triangle might be resolved. Of the problems thus derived, we shall only, for the present, consider two cases. 35. Problem. To find a given star's hour angle and altitude, when it is upon the prime vertical. Solution. The angle PZB is, in this case, a right angle, and if we use the preceding notation, we have ' cos. h = cotan. L cotan. p = ± cotan. L tang....