Outlines of Astronomy |
From inside the book
Results 1-5 of 91
Page 18
... 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 ...
Page 19
... angle NMQ becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more ...
... angle NMQ becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more ...
Page 29
... angle S As , by which a celestial object at any assigned altitude , HA 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 As , by which a celestial object at any assigned altitude , HA 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 ...
Page 35
... that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a materially less angle , than when seen at a great alti- - tude in the sky , owing to its greater distance D 2 REFRACTION . 35.
... that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a materially less angle , than when seen at a great alti- - tude in the sky , owing to its greater distance D 2 REFRACTION . 35.
Page 49
... angle , APB = c Pp , 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 occasion to refer to it ...
... angle , APB = c Pp , 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 occasion to refer to it ...
Other editions - View all
Common terms and phrases
amount angle angular appear apsides ascertained astronomical atmosphere attraction axis bright calculation celestial circle coincidence comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations phænomena phænomenon planet planetary pole portion position precession precisely proper motion proportion recede recess refraction remarkable respect result revolution revolving right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible whole zenith