Outlines of astronomy |
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Page 16
... side round which the sun , moon , and stars can pass ; and that side must , at least , be so far like what we see , that it must have a sky and sunshine , and a day when it is night to us , and vice versâ ; where , in short , 46 ' redit ...
... side round which the sun , moon , and stars can pass ; and that side must , at least , be so far like what we see , that it must have a sky and sunshine , and a day when it is night to us , and vice versâ ; where , in short , 46 ' redit ...
Page 35
... side than on the upper ; so that the apparent form is neither circular nor elliptic , but a species of oval , which de- viates more from a circle below than above . This singular effect , which any one may notice in a fine sunset ...
... side than on the upper ; so that the apparent form is neither circular nor elliptic , but a species of oval , which de- viates more from a circle below than above . This singular effect , which any one may notice in a fine sunset ...
Page 60
... side of the equator , over every point of which respectively , the sun in its diurnal course passes vertically on the 21st of March and the 21st of September in every year . Their latitudes are about 23 ° 28 ′ respectively , north and ...
... side of the equator , over every point of which respectively , the sun in its diurnal course passes vertically on the 21st of March and the 21st of September in every year . Their latitudes are about 23 ° 28 ′ respectively , north and ...
Page 73
... side of the equinoctial opposite to that of the elevated pole . If Z S be so , the ob- ject is below the horizon ... sides and angles of this most useful triangle : viz . 1st , The co - latitude of the place of observation ; 2d , the ...
... side of the equinoctial opposite to that of the elevated pole . If Z S be so , the ob- ject is below the horizon ... sides and angles of this most useful triangle : viz . 1st , The co - latitude of the place of observation ; 2d , the ...
Page 83
... side too large . And , 2dly , that whatever be the amount of the excentricity , and on whatever part of the circle any proposed angle is measured , the effect of the error in question on the result of observations depending on the ...
... side too large . And , 2dly , that whatever be the amount of the excentricity , and on whatever part of the circle any proposed angle is measured , the effect of the error in question on the result of observations depending on the ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical attraction axis bright calculation celestial circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Julian period 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 perturbations phænomena planet planetary pole portion position precession proper motions proportion recede reckoned 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 vols whole zenith