The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 144
=: 90° — /i (AS),its zenith distance. From the figure, OZ = QA + AZ, or L = d-\- z. By atteniing to the signs of s and d, the above equation may be con-sidered true for all positions of the body; marking the zenith distancenegative when the body is north of the zenith, as at A. In case the body is… … NPL PAP.D. + NA,+ /,. or In this formula, for south latitude P. D. must be the bodys south polar distance, and the value of P. 1 >. -j- // isthe only numerical value of the latitude. NVhcn the heavenly body is on the equator, or its declination is equal to o, the zenith distance will be equal…
Navigation · Nautical astronomy
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