Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка 28
... portion of it which we can see at a single view , to allow of our forming any judgment of the form of the whole , from that of a part so disfigured . But with the surface of the sea or any vastly extended level plain , the case is ...
... portion of it which we can see at a single view , to allow of our forming any judgment of the form of the whole , from that of a part so disfigured . But with the surface of the sea or any vastly extended level plain , the case is ...
Сторінка 30
... portion of the earth's surface visible to a spectator at M , and the angle NMQ included between the two extreme visual rays is the measure of its apparent angular diameter . Leaving , at present , out of consideration the effect of ...
... portion of the earth's surface visible to a spectator at M , and the angle NMQ included between the two extreme visual rays is the measure of its apparent angular diameter . Leaving , at present , out of consideration the effect of ...
Сторінка 31
... portion or zone of it which lies between XN and YQ ; in other words , his sky will be more than a hemi- sphere by the zone YQXN . It is the angular breadth of this redundant zone -the angle YMQ , by which the visible horizon appears ...
... portion or zone of it which lies between XN and YQ ; in other words , his sky will be more than a hemi- sphere by the zone YQXN . It is the angular breadth of this redundant zone -the angle YMQ , by which the visible horizon appears ...
Сторінка 32
... 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 have prevented an equally perfect view of the whole . ( 26. ) The history of ...
... 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 have prevented an equally perfect view of the whole . ( 26. ) The history of ...
Сторінка 34
... to the whole earth's surface , is that of five miles to 8000 , or 1 to 1600. The portion visible from Etna , the Peak of Teneriffe , or Mowna Roa , is about one 4000th . à ( 33. ) When we ascend to any very 34 OUTLINES OF ASTRONOMY .
... to the whole earth's surface , is that of five miles to 8000 , or 1 to 1600. The portion visible from Etna , the Peak of Teneriffe , or Mowna Roa , is about one 4000th . à ( 33. ) When we ascend to any very 34 OUTLINES OF ASTRONOMY .
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
altitude amount angle angular appear apsides ascertained astronomers 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 effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric horizon inclination increase 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 perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable render respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith