Outlines of Astronomy |
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Page xii
... Variation of gravity on its surface . Statical and dynamical measures of gravity . The pendulum . Gravity to a spheroid . Other effects of the Earth's rotation . Trade winds . Determination of geo- graphical positions — of latitudes ...
... Variation of gravity on its surface . Statical and dynamical measures of gravity . The pendulum . Gravity to a spheroid . Other effects of the Earth's rotation . Trade winds . Determination of geo- graphical positions — of latitudes ...
Page xiv
... Variation of elements in general . Distinction between periodic and secular variations . Geometrical expression of tangential and normal forces . Varia- tion of the Major Axis produced only by the tangential force . Lagrange's theorem ...
... Variation of elements in general . Distinction between periodic and secular variations . Geometrical expression of tangential and normal forces . Varia- tion of the Major Axis produced only by the tangential force . Lagrange's theorem ...
Page xv
... variations of the elements of both planets . Long inequality of the Earth and Venus . Variation of the epoch . Inequalities incident on the epoch affecting the mean motion . Interpretation of the constant part of these inequalities ...
... variations of the elements of both planets . Long inequality of the Earth and Venus . Variation of the epoch . Inequalities incident on the epoch affecting the mean motion . Interpretation of the constant part of these inequalities ...
Page 40
... variations . ( 43. ) 1st . In the zenith there is no refraction . A celestial object , situated vertically over ... variation , owing to these two causes , from its mean amount ( at temp . 55 ° , pressure 30 inches ) , are about one ...
... variations . ( 43. ) 1st . In the zenith there is no refraction . A celestial object , situated vertically over ... variation , owing to these two causes , from its mean amount ( at temp . 55 ° , pressure 30 inches ) , are about one ...
Page 56
... variation . Not only this , but at whatever point of the earth's surface the measure- ment is performed , the results are absolutely identical . No instruments ever yet invented by man are delicate enough to indicate , by an increase or ...
... variation . Not only this , but at whatever point of the earth's surface the measure- ment is performed , the results are absolutely identical . No instruments ever yet invented by man are delicate enough to indicate , by an increase or ...
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Common terms and phrases
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 ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater 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 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