Outlines of Astronomy |
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Page xv
... visible course among the constellations . Its internal structure . Its apparently indefinite extent in certain directions . Of the distance of the fixed stars . annual parallax . Parallactic unit of sidereal distance . Effect of ...
... visible course among the constellations . Its internal structure . Its apparently indefinite extent in certain directions . Of the distance of the fixed stars . annual parallax . Parallactic unit of sidereal distance . Effect of ...
Page 24
... visible universe , their constitution and physical condition , so far as they can be known to us , with their mutual influences and actions on each other , so far as they can be traced by the effects produced , and established by ...
... visible universe , their constitution and physical condition , so far as they can be known to us , with their mutual influences and actions on each other , so far as they can be traced by the effects produced , and established by ...
Page 30
... visible horizon ; and as this tangent sweeps round M , and comes successively into the posi- tions MOo , MPP , MQq , the point of contact N will mark out on the sur- face the circle NOPQ . The area of the spherical surface comprehended ...
... visible horizon ; and as this tangent sweeps round M , and comes successively into the posi- tions MOo , MPP , MQq , the point of contact N will mark out on the sur- face the circle NOPQ . The area of the spherical surface comprehended ...
Page 31
... visible horizon appears depressed below the direction of a spirit - level - that is called the dip of the horizon . It is a correction of constant use in nautical astronomy . ( 24. ) From the foregoing explanations it appears , 1st ...
... visible horizon appears depressed below the direction of a spirit - level - that is called the dip of the horizon . It is a correction of constant use in nautical astronomy . ( 24. ) From the foregoing explanations it appears , 1st ...
Page 32
... visible horizon of both , will lie just half - way between them , and if we suppose a Db to be the sphere of the earth , and C its centre in the figure CD b B , we know Db , the length of the arch of the circle between D and b , —viz ...
... visible horizon of both , will lie just half - way between them , and if we suppose a Db to be the sphere of the earth , and C its centre in the figure CD b B , we know Db , the length of the arch of the circle between D and b , —viz ...
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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