Outlines of astronomy |
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Page xx
... diameter . Its parallax , distance , and real diameter . First approximation to its orbit . An ellipse about the Earth in the focus . Its excentricity and inclination . Motion of its nodes and apsides . Of occultations and solar ...
... diameter . Its parallax , distance , and real diameter . First approximation to its orbit . An ellipse about the Earth in the focus . Its excentricity and inclination . Motion of its nodes and apsides . Of occultations and solar ...
Page 17
... diameter , measured with an instrument called the dip sector , is the same ( except under some singular atmospheric circumstances , which produce a temporary dis- tortion of the outline ) , in whatever direction the measure is taken ...
... diameter , measured with an instrument called the dip sector , is the same ( except under some singular atmospheric circumstances , which produce a temporary dis- tortion of the outline ) , in whatever direction the measure is taken ...
Page 19
... 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 and more the higher we ascend . The figure exhibits three states or stages of ...
... 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 and more the higher we ascend . The figure exhibits three states or stages of ...
Page 22
... diameter bears the same proportion to the distance of the visible horizon from the eye as that distance does to the height of the eye above the sea level . When the stations are unequal in height , the problem is a little more ...
... diameter bears the same proportion to the distance of the visible horizon from the eye as that distance does to the height of the eye above the sea level . When the stations are unequal in height , the problem is a little more ...
Page 23
... diameter ; consequently , on a globe of sixteen inches in diameter , such a mountain would be represented by a protuberance of no more than one hundredth part of an inch , which is about the thickness of ordinary drawing - paper . Now ...
... diameter ; consequently , on a globe of sixteen inches in diameter , such a mountain would be represented by a protuberance of no more than one hundredth part of an inch , which is about the thickness of ordinary drawing - paper . Now ...
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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 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