Outlines of astronomy |
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Page xxi
... sphere . Climate . Radiation of heat from its surface . Rotation on its own axis . Libration . Appearance of the Earth from it . Probable elongation of the Moon's figure in the direction of the Earth . Its habitability not possible ...
... sphere . Climate . Radiation of heat from its surface . Rotation on its own axis . Libration . Appearance of the Earth from it . Probable elongation of the Moon's figure in the direction of the Earth . Its habitability not possible ...
Page 3
... sphere , he finds it , in comparison , a mere point ; so lost- even in the minute system to which it belongs — as to be in- visible and unsuspected from some of its principal and remoter members . ( 3. ) There is hardly any thing which ...
... sphere , he finds it , in comparison , a mere point ; so lost- even in the minute system to which it belongs — as to be in- visible and unsuspected from some of its principal and remoter members . ( 3. ) There is hardly any thing which ...
Page 17
... sphere or globe . ( 22. ) A diagram will elucidate this . Suppose the earth to be represented by the sphere LHNQ , whose centre is C , and let A , G , M be stations at different elevations above various points of its surface ...
... sphere or globe . ( 22. ) A diagram will elucidate this . Suppose the earth to be represented by the sphere LHNQ , whose centre is C , and let A , G , M be stations at different elevations above various points of its surface ...
Page 18
... spherical surface compre- Ο 2 M m B hended within this circle is the portion of the earth's surface visible to a ... sphere , the visible area , i . e . the spherical segment or slice NOPQ , increases ; 2dly , that the distance of ...
... spherical surface compre- Ο 2 M m B hended within this circle is the portion of the earth's surface visible to a ... sphere , the visible area , i . e . the spherical segment or slice NOPQ , increases ; 2dly , that the distance of ...
Page 19
... sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the horizon . Mm , which is perpendicular to the general surface of the sphere at m , is also the direction in which a plumb - line * would hang ; for ...
... sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the horizon . Mm , which is perpendicular to the general surface of the sphere at m , is also the direction in which a plumb - line * would hang ; for ...
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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 Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical 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 recess reckoned refraction remarkable respect result revolution 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