Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xi
... angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural circle . The Meridian circle . Fixation of polar and horizontal points . The level , plumb - line , artificial horizon ...
... angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural circle . The Meridian circle . Fixation of polar and horizontal points . The level , plumb - line , artificial horizon ...
Сторінка xii
... angular velocity . Equable description of areas . Parallax of the Sun. Its distance and magnitude . Copernican explanation of the Sun's apparent motion . Parallelism of the Earth's axis . The seasons . Heat received from the Sun in ...
... angular velocity . Equable description of areas . Parallax of the Sun. Its distance and magnitude . Copernican explanation of the Sun's apparent motion . Parallelism of the Earth's axis . The seasons . Heat received from the Sun in ...
Сторінка 29
... angular diameter of the visible area , as measured by the dip sec- tor , is materially less than at a lower level ; or , in other words , that the apparent size of the earth has sensibly diminished as we have receded from its surface ...
... angular diameter of the visible area , as measured by the dip sec- tor , is materially less than at a lower level ; or , in other words , that the apparent size of the earth has sensibly diminished as we have receded from its surface ...
Сторінка 30
... angular diameter . Leaving , at present , out of consideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this is ...
... angular diameter . Leaving , at present , out of consideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this is ...
Сторінка 31
... angular breadth of this redundant zone -the angle YMQ , by which the visible horizon appears depressed below the direction of a spirit - level - that is called the dip of the horizon . It is a correction of constant use in nautical ...
... angular breadth of this redundant zone -the angle YMQ , by which the visible horizon appears depressed below the direction of a spirit - level - that is called the dip of the horizon . It is a correction of constant use in nautical ...
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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