American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 139
icular to this line at O, and mark its inter-section wdth the circumference Z. The line NS isthe horizon; Z is the zenith. The arc ZS is that por-tion of the meridian between the zenith and the southpoint of the horizon; the arc ZN is that portion of themeridian between the zenith and the north… … FlQ. 51.
Navigation · Nautical astronomy
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