The mariners' handbook; a convenient reference book for navigators, yachtsmen, and seamen of all classes (1906)
International Correspondence Schools, Roden, Ernest Konrad, 1866-, International Correspondence Schools. Pocketbook · Scranton, Pa. : International Textbook Co. · leaf 153
through thecelestial poles and intersecting the celestial equator atright angles. They are identical to meridians of the earthextended toward the celestial sphere. The celestial meridianmost freqtiently in use by navigators passes through thezenith, and consequently through the north and south… … Jiuiionnl Horizon Fig. 1 Diurnal motion is the apparent daily motion of theheavenly bodies from east to west caused by the rotationof the earth on its axis. Zenith is the point Z, Fig. 1, of the celestial sphere that isvertically above the head of an observer. The zenith ofany point on the surface…
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