Outlines of Astronomy |
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Page xiii
... extreme tenuity . Their probable structure . Motions conformable to the law of gravity . Actual dimensions of comets . Periodical return of several . Halley's comet . Other ancient comets probably periodic . Encke's comet - Biela's ...
... extreme tenuity . Their probable structure . Motions conformable to the law of gravity . Actual dimensions of comets . Periodical return of several . Halley's comet . Other ancient comets probably periodic . Encke's comet - Biela's ...
Page 30
... extreme visual rays is the measure of its apparent angular diameter . Leaving , at present , out of consideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to ...
... extreme visual rays is the measure of its apparent angular diameter . Leaving , at present , out of consideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to ...
Page 36
... extreme rapidity as we recede upwards , till , within a very moderate distance ( such as would be represented by the sixth of an inch on the model we have before spoken of , and which is not more in proportion to the globe on which it ...
... extreme rapidity as we recede upwards , till , within a very moderate distance ( such as would be represented by the sixth of an inch on the model we have before spoken of , and which is not more in proportion to the globe on which it ...
Page 37
... extreme tenuity of the uppermost strata ; but as it advances down- wards , the strata continually increasing in density , it will continually undergo greater and greater refraction in the same direction ; and thus , instead of pursuing ...
... extreme tenuity of the uppermost strata ; but as it advances down- wards , the strata continually increasing in density , it will continually undergo greater and greater refraction in the same direction ; and thus , instead of pursuing ...
Page 51
... extreme circumference of this segment just graze the southern point of his hori- zon , and show themselves for a few moments above it , precisely as those near the circumference of the northern segment graze his northern hori- zon , and ...
... extreme circumference of this segment just graze the southern point of his hori- zon , and show themselves for a few moments above it , precisely as those near the circumference of the northern segment graze his northern hori- zon , and ...
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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