Outlines of Astronomy |
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Page xi
... measurements of time . Clocks , chronome- ters . Of astronomical measurements . Principle of telescopic sights to increase the accuracy of pointing . Simplest application of this principle . The transit instrument . Of the measurement ...
... measurements of time . Clocks , chronome- ters . Of astronomical measurements . Principle of telescopic sights to increase the accuracy of pointing . Simplest application of this principle . The transit instrument . Of the measurement ...
Page xii
... measures of gravity . The pendulum . Gravity to a spheroid . Other effects of the Earth's rotation . Trade winds ... Measurement of heights by the barometer ......... 118 CHAPTER V. OF URANOGRAPHY . Construction of celestial maps and ...
... measures of gravity . The pendulum . Gravity to a spheroid . Other effects of the Earth's rotation . Trade winds ... Measurement of heights by the barometer ......... 118 CHAPTER V. OF URANOGRAPHY . Construction of celestial maps and ...
Page 28
... measured with an instru- ment called the dip sector , is the same ( except under some singular atmos . pheric circumstances , which produce a temporary distortion of the outline ) , in whatever direction the measure is taken ...
... measured with an instru- ment called the dip sector , is the same ( except under some singular atmos . pheric circumstances , which produce a temporary distortion of the outline ) , in whatever direction the measure is taken ...
Page 30
... measure of its apparent angular diameter . Leaving , at present , out of consideration the effect of refraction in ... measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point ...
... measure of its apparent angular diameter . Leaving , at present , out of consideration the effect of refraction in ... measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point ...
Page 32
... measure the heights and exact distance of two sta- tions which could barely be discerned from each other over the edge of the horizon , we could ascertain the actual size of the earth itself : and , in fact , were it not for the effect ...
... measure the heights and exact distance of two sta- tions which could barely be discerned from each other over the edge of the horizon , we could ascertain the actual size of the earth itself : and , in fact , were it not for the effect ...
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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