Outlines of astronomy |
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Page 25
... amount of this additional relief , or the ponderable quantity of air surmounted , would be by no means in pro- portion to the additional height ascended , but in a constantly decreasing ratio . An easy calculation , however , founded on ...
... amount of this additional relief , or the ponderable quantity of air surmounted , would be by no means in pro- portion to the additional height ascended , but in a constantly decreasing ratio . An easy calculation , however , founded on ...
Page 27
... impression respecting their places , which must be rectified by ascertaining the amount and direction of the displacement so apparently produced on each , before we can come at a knowledge of the true directions in REFRACTION . 27.
... impression respecting their places , which must be rectified by ascertaining the amount and direction of the displacement so apparently produced on each , before we can come at a knowledge of the true directions in REFRACTION . 27.
Page 30
... amount of this diminution at different heights , is not yet fully ascertained . Moreover , the refracting power of air is perceptibly affected by its moisture ; and this , too , is not the same in every part of an aërial column ...
... amount of this diminution at different heights , is not yet fully ascertained . Moreover , the refracting power of air is perceptibly affected by its moisture ; and this , too , is not the same in every part of an aërial column ...
Page 31
... amount of refraction , for an object half- way between the zenith and horizon , or at an apparent alti- tude of 45 ° , is about l ' ( more exactly 57 " ) , a quantity hardly sensible to the naked eye ; but at the visible horizon it amounts ...
... amount of refraction , for an object half- way between the zenith and horizon , or at an apparent alti- tude of 45 ° , is about l ' ( more exactly 57 " ) , a quantity hardly sensible to the naked eye ; but at the visible horizon it amounts ...
Page 35
... amount . This refraction between terrestrial stations is termed terrestrial refraction , to distinguish it from that total effect which is only produced on celestial objects , or such as are beyond the atmosphere , and which is called ...
... amount . This refraction between terrestrial stations is termed terrestrial refraction , to distinguish it from that total effect which is only produced on celestial objects , or such as are beyond the atmosphere , and which is called ...
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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