American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 133
eridian NZS; O, the center of the sphere; NS, the horizon; P and P, the poles of the sphere; QOQ, the equator; Z, the zenith of theobserver. Then, by the above definition, ZQ willbe the latitude of the observer; and NP, the altitudeof the elevated pole, will also equal the latitude. Let M be the… … FIG. 50. By attending to the names of z and d, markingthe zenith distance north or south according as thezenith is north or south of the body, the aboveequation may be considered general for any position of the body at upper transit,asM, M, M. In case the body is below the pole, as at M—that is, at…
Navigation · Nautical astronomy
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