Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 18
... length will become a tangent to the sphere at is the line ry . ( 23. ) This explains what is meant by the dip of the hor Mm , which is perpendicular to the general surface of sphere at m , is also the direction in which a plumb - line ...
... length will become a tangent to the sphere at is the line ry . ( 23. ) This explains what is meant by the dip of the hor Mm , which is perpendicular to the general surface of sphere at m , is also the direction in which a plumb - line ...
Page 18
... length will become a tangent to the sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the horizon . Mm , which is perpendicular to the general surface of the sphere at m , is also the direction in which ...
... length will become a tangent to the sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the horizon . Mm , which is perpendicular to the general surface of the sphere at m , is also the direction in which ...
Page 20
... length the whole disappears : while yet the distinctness with which the last portion of the sail d is seen is such as to satisfy us that were it not for the interposed segment of the sea , ABCDE , the distance TE is not so great as to ...
... length the whole disappears : while yet the distinctness with which the last portion of the sail d is seen is such as to satisfy us that were it not for the interposed segment of the sea , ABCDE , the distance TE is not so great as to ...
Page 21
... length of the arch C of the circle between D and b , — viz . half the measured interval , and b B , the excess of its secant above its radius which is the height of B , data which , by the solution . of an easy geometrical problem ...
... length of the arch C of the circle between D and b , — viz . half the measured interval , and b B , the excess of its secant above its radius which is the height of B , data which , by the solution . of an easy geometrical problem ...
Page 34
... length remains the same . The dilated size ( generally ) of the sun or moon , when seen near the horizon , beyond what they appear to have when high up in the sky , has nothing to do with refraction . It is an illusion of the judgment ...
... length remains the same . The dilated size ( generally ) of the sun or moon , when seen near the horizon , beyond what they appear to have when high up in the sky , has nothing to do with refraction . It is an illusion of the judgment ...
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angle angular appear apsides ascertained astronomical axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe heavens heliocentric horizon inclination inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian moon moon's motion nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations planet planetary pole portion position Post 8vo precession proper motions proportion recede recess reckoned refraction respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole Woodcuts zenith
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Page 674 - A Dictionary of Science, Literature, and Art : Comprising the History, Description, and Scientific Principles of every Branch of Human Knowledge ; with the Derivation and Definition of all the Terms in General Use. Edited by WT BRANDE, FRSL and E.