Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
З цієї книги
Результати 1-5 із 100
Сторінка 30
... angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the ...
... angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the ...
Сторінка 31
... angles to Mm , and therefore parallel to x my , the tangent to the sphere at m . A spectator placed at M will ... angle YMQ , by which the visible horizon appears depressed below the direction of a spirit - level - that is called ...
... angles to Mm , and therefore parallel to x my , the tangent to the sphere at m . A spectator placed at M will ... angle YMQ , by which the visible horizon appears depressed below the direction of a spirit - level - that is called ...
Сторінка 39
... angle S A s , by which a celestial object at any assigned altitude , H A S , is raised in appearance above its true place , is , unfortunately , a very difficult subject of physical inquiry , and one on which geometers ( from whom alone ...
... angle S A s , by which a celestial object at any assigned altitude , H A S , is raised in appearance above its true place , is , unfortunately , a very difficult subject of physical inquiry , and one on which geometers ( from whom alone ...
Сторінка 54
... angle , A P B = c P p , at the near object P than at the remote one Q. ( 69. ) A consequence of the familiar appearance we have adduced in illustration of these principles is worth noticing , as we shall have occa- sion to refer to it ...
... angle , A P B = c P p , at the near object P than at the remote one Q. ( 69. ) A consequence of the familiar appearance we have adduced in illustration of these principles is worth noticing , as we shall have occa- sion to refer to it ...
Сторінка 55
... angles DBP and DAP ; now , DBP being the exte- rior angle of the triangle ABP , is equal to the sum of the interior and opposite , DBP = DAP + APB , whence DBP - DAP = APB . ( 71. ) It follows from what has been said that the amount of ...
... angles DBP and DAP ; now , DBP being the exte- rior angle of the triangle ABP , is equal to the sum of the interior and opposite , DBP = DAP + APB , whence DBP - DAP = APB . ( 71. ) It follows from what has been said that the amount of ...
Інші видання - Показати все
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