Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка 30
... perpendicular to the surface of still water ; and , moreover , that it is also exactly perpendicular to a line or surface truly adjusted by a spirit - level.2 Suppose , then , that at our station M we were to adjust a line ( a wooden ...
... perpendicular to the surface of still water ; and , moreover , that it is also exactly perpendicular to a line or surface truly adjusted by a spirit - level.2 Suppose , then , that at our station M we were to adjust a line ( a wooden ...
Сторінка 32
... perpendicular heights Aa and Bb ( which , for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measure- ment ; then it is clear that D , the visible horizon of both ...
... perpendicular heights Aa and Bb ( which , for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measure- ment ; then it is clear that D , the visible horizon of both ...
Сторінка 34
... perpendicular elevation : this is only one 1600th part of the earth's diameter ; consequently , on a globe of sixteen inches . in diameter , such a mountain would be represented by a protuberance of no more than one hundredth part of an ...
... perpendicular elevation : this is only one 1600th part of the earth's diameter ; consequently , on a globe of sixteen inches . in diameter , such a mountain would be represented by a protuberance of no more than one hundredth part of an ...
Сторінка 35
... perpendicular elevation ( which is rather less than that of the summit of Etna ' ) we have ascended through about one - third ; and at 18,000 feet ( which is nearly that of Cotopaxi ) through one - half the material , or , at least ...
... perpendicular elevation ( which is rather less than that of the summit of Etna ' ) we have ascended through about one - third ; and at 18,000 feet ( which is nearly that of Cotopaxi ) through one - half the material , or , at least ...
Сторінка 62
... perpendicular to the earth's axis , and passing through its centre . ( 85. ) DEF . 4. The terrestrial meridian of a station on the earth's surface , is a great circle of the globe passing through both poles and through the plane . The ...
... perpendicular to the earth's axis , and passing through its centre . ( 85. ) DEF . 4. The terrestrial meridian of a station on the earth's surface , is a great circle of the globe passing through both poles and through the plane . The ...
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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