Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xi
... globe of the Earth - to the celestial sphere . Celestial perspective 62 CHAPTER III . Of the nature of astronomical instruments and observations in general . Of sidereal and solar time . Of the measurements of time . Clocks , chronome ...
... globe of the Earth - to the celestial sphere . Celestial perspective 62 CHAPTER III . Of the nature of astronomical instruments and observations in general . Of sidereal and solar time . Of the measurements of time . Clocks , chronome ...
Сторінка 29
... globe . ( 22. ) A diagram will elucidate this . Suppose the earth to be repre- sented by the sphere LHNQ , whose centre is C , and let A , G , M be sta- tions at different elevations above various points of its surface , represented Fig ...
... globe . ( 22. ) A diagram will elucidate this . Suppose the earth to be repre- sented by the sphere LHNQ , whose centre is C , and let A , G , M be sta- tions at different elevations above various points of its surface , represented Fig ...
Сторінка 30
... globe NmQ between them . It is clear , that as the joint M is urged home towards the surface , the legs will open , and the ruler will become more nearly straight , but will not attain perfect straightness till M is brought fairly up to ...
... globe NmQ between them . It is clear , that as the joint M is urged home towards the surface , the legs will open , and the ruler will become more nearly straight , but will not attain perfect straightness till M is brought fairly up to ...
Сторінка 31
... globe . In this we also include that of the sea , which , wherever it extends , covers and fills in those inequalities and local irregularities which exist on land , but which can of course only be regarded as trifling deviations from ...
... globe . In this we also include that of the sea , which , wherever it extends , covers and fills in those inequalities and local irregularities which exist on land , but which can of course only be regarded as trifling deviations from ...
Сторінка 34
... globe of sixteen inches . in diameter , such a mountain would be represented by a protuberance of no more than one hundredth part of an inch , which is about the thickness of ordinary drawing - paper . Now , as there is no entire ...
... globe of sixteen inches . in diameter , such a mountain would be represented by a protuberance of no more than one hundredth part of an inch , which is about the thickness of ordinary drawing - paper . Now , as there is no entire ...
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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