Outlines of Astronomy |
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Page 22
... evident that our aim is not to offer to the public a technical treatise , in which the student of practical or theoretical astronomy shall find consigned the minute description of methods of observation , or the formulæ he requires ...
... evident that our aim is not to offer to the public a technical treatise , in which the student of practical or theoretical astronomy shall find consigned the minute description of methods of observation , or the formulæ he requires ...
Page 25
... evident , that , to form any just notions of the arrangement , in space , of a number of objects which we cannot approach and examine , but of which all the information we can gain is by sitting still and watch- ing their evolutions ...
... evident , that , to form any just notions of the arrangement , in space , of a number of objects which we cannot approach and examine , but of which all the information we can gain is by sitting still and watch- ing their evolutions ...
Page 26
... evident , subsist undetected by us . There is no peculiar sensation which advertises us that we are in motion . We perceive jerks , or shocks , it is true , because these are sud- den changes of motion , produced , as the laws of ...
... evident , subsist undetected by us . There is no peculiar sensation which advertises us that we are in motion . We perceive jerks , or shocks , it is true , because these are sud- den changes of motion , produced , as the laws of ...
Page 30
... evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the spher- ical segment or slice NOPQ , increases ; 2dly , that the distance of the vis- ible ...
... evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the spher- ical segment or slice NOPQ , increases ; 2dly , that the distance of the vis- ible ...
Page 42
... evident , that whenever a ray passes obliquely from a higher level to a lower one , or vice versâ , its course is not rectilinear , but concave downwards ; and of course any object seen by means of such a ray , must appear deviated from ...
... evident , that whenever a ray passes obliquely from a higher level to a lower one , or vice versâ , its course is not rectilinear , but concave downwards ; and of course any object seen by means of such a ray , must appear deviated from ...
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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