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Page xvii
... seen by Mr. Dawes . PLATE II . Fig . 1. Messier's 13th Nebula resolved into Stars . Fig . 2. The Comet of 1819 . Fig . 3. The Nebula in Andromeda . PLATE III . Fig . 1. Mars as seen August 16th , 1830 . Fig . 2. Jupiter as seen ...
... seen by Mr. Dawes . PLATE II . Fig . 1. Messier's 13th Nebula resolved into Stars . Fig . 2. The Comet of 1819 . Fig . 3. The Nebula in Andromeda . PLATE III . Fig . 1. Mars as seen August 16th , 1830 . Fig . 2. Jupiter as seen ...
Page 17
... seen ; but from these again - in those few and rare occasions when the transparency of the air will permit the real boundary of the horizon , the true sea - line , to be seen- the very same appearances are witnessed , but with this re ...
... seen ; but from these again - in those few and rare occasions when the transparency of the air will permit the real boundary of the horizon , the true sea - line , to be seen- the very same appearances are witnessed , but with this re ...
Page 20
... seen perfectly well beyond the offing or visible horizon — but not the whole of them . We only see their upper parts . Their bases where they rest on , or rise out of the water , are hid from view by the spherical surface of the sea ...
... seen perfectly well beyond the offing or visible horizon — but not the whole of them . We only see their upper parts . Their bases where they rest on , or rise out of the water , are hid from view by the spherical surface of the sea ...
Page 27
... seen obliquely through it appear otherwise situated than they would to the same spectator , had the atmosphere no existence . It thus produces a false impression respecting their places , which must be rectified by ascertaining the ...
... seen obliquely through it appear otherwise situated than they would to the same spectator , had the atmosphere no existence . It thus produces a false impression respecting their places , which must be rectified by ascertaining the ...
Page 29
... seen in the direction which the visual ray has at the instant of arriving at the eye , without regard to what may have been otherwise its course between the object and the eye . Hence the star S will be seen , not in the di- rection AS ...
... seen in the direction which the visual ray has at the instant of arriving at the eye , without regard to what may have been otherwise its course between the object and the eye . Hence the star S will be seen , not in the di- rection AS ...
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amount angle angular appear apsides ascertained astronomical attraction axis bright calculation celestial circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Julian period 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 phænomena planet planetary pole portion position precession proper motions proportion recede reckoned refraction remarkable respect result revolution revolving right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole zenith