 | Nautical astronomy - 1821 - 708 pages
...circles of declination ; of these 24, which divide the equator into equal parts, each containing 1ft0, are called hour circles. Small circles parallel to the celestial equator are called paralltlt of declination. The sensible horizon is that circle in the. heavens whose, plane touches... | |
 | Nathaniel Bowditch - Nautical astronomy - 1826 - 732 pages
...circles of declination; of these 24, which divide the equator into equal part-, each containing 10°, are called hour circles. Small circles parallel to the celestial equator are called para/Ms of declination. • If the radius drawn from uie centre of the earth to the_place where the... | |
 | Benjamin Peirce - Plane trigonometry - 1845 - 498 pages
...to a great circle are great circles which pass through its poles, and are consequentlyperpendicular to it." [B. p. 48.] 6. "If the plane of the terrestrial...the vernal equinox, bears the same relation to other Right ascension. Horizon. circles of declination, which the first meridian does to other terrestrial... | |
 | Nathaniel Bowditch - 1846 - 854 pages
...circles of declination ; of these 24, which divide the equator into equal parts, each containing 15°, are called hour circles. Small circles parallel to...celestial equator are called parallels of declination. The sensible horizon is that circle in the heavens whose plane touches the earth at the spectator;... | |
 | James Inman - Nautical astronomy - 1849 - 302 pages
...declination ; and great circles passing through the pole of the ecliptic are called circles of latitude. Small circles parallel to the celestial equator are called parallels of declination. Small circles parallel to the ecliptic are called parallels of latitude. (97.) The declination and... | |
 | James Inman - 1872 - 818 pages
...declination ; and great circles passing through the pole of the ecliptic are called circles of latitude. Small circles parallel to the celestial equator are called parallels of declination. Small circles parallel to the ecliptic are called parallels nj latitude. (97.) The declination and... | |
 | Nautical astronomy - 1880 - 880 pages
...declination ; of these 24, which divide the equator into equal parts, each containing 15°, are culled hour circles. Small circles parallel to the celestial equator are called parallels of declination. The sensible horizon is that circle in the heavens whose plane touches the; earth at the spectator.... | |
 | Forest Ray Moulton - Astronomy - 1912 - 284 pages
...or it is the great circle in which the plane of the earth's equator cuts the celestial sphere. The small circles parallel to the celestial equator are called parallels of declination. In Fig. 31 I'EB represents the equator and DCF a parallel of declination. The celestial equator corresponds... | |
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Secondaries to the celestial equator are called circles of declination; of these 24, which divide the equator into equal parts of 15° each, are called hour circles. 