The Geography of the Heavens, and Class Book of Astronomy: Accompanied by a Celestial Atlas |
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Page xviii
... axis , the causes of the seasons , the difficulty of reconciling the apparent motions of the planets with their real mo- tions in circular or elliptical orbits , the effects produced by centri- fugal and centripetal forces , the ...
... axis , the causes of the seasons , the difficulty of reconciling the apparent motions of the planets with their real mo- tions in circular or elliptical orbits , the effects produced by centri- fugal and centripetal forces , the ...
Page 26
... Axis of the Earth is an imaginary line , passing through its centre , north and south , about which its diurnal revolution is performed . The Poles of the Earth are the extremities of its axis . The Axis of the Heavens is the axis of ...
... Axis of the Earth is an imaginary line , passing through its centre , north and south , about which its diurnal revolution is performed . The Poles of the Earth are the extremities of its axis . The Axis of the Heavens is the axis of ...
Page 27
... axis of the Eclip- tic makes the same angle with the axis of the heavens ; so that the poles of each are 234 ° apart . This angle is perpetually decreasing . At the commencement of the Christian era , it was about 230 45 ' . At the ...
... axis of the Eclip- tic makes the same angle with the axis of the heavens ; so that the poles of each are 234 ° apart . This angle is perpetually decreasing . At the commencement of the Christian era , it was about 230 45 ' . At the ...
Page 29
... axis ; so that they rise and set sooner every succeeding day by about four minutes , than they did on the preceding . This is called their daily acceleration . It amounts to just two hours a month . EXAMPLE . Those stars and ...
... axis ; so that they rise and set sooner every succeeding day by about four minutes , than they did on the preceding . This is called their daily acceleration . It amounts to just two hours a month . EXAMPLE . Those stars and ...
Page 50
... axis similar to that of the sun . He also observes , of variable stars generally : - " The rotary motion of stars upon their axes is a capital feature in their resemblance to the sun . It appears to me now , that we cannot refuse to ...
... axis similar to that of the sun . He also observes , of variable stars generally : - " The rotary motion of stars upon their axes is a capital feature in their resemblance to the sun . It appears to me now , that we cannot refuse to ...
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Common terms and phrases
3d magnitude 4th magnitude ancient angle appear Arcturus Argo Navis Aries astronomers Auriga axis Beta brightest called Cassiopeia celestial centre Cepheus circle cluster colure comet constellation Cor Caroli declination degree Denebola diameter direction distinguished diurnal motion Earth east ecliptic equal equator equinoctial figure fixed stars Gamma globe head heavenly bodies heavens Hercules Herschel horizon Hydra Jupiter latitude length Libra light longitude maps mean distance Mercury meridian millions of miles minutes Moon Moon's motion naked eye nearest nearly nebulæ night node north pole northern observed orbit Orion parallax passing perihelion period Perseus phenomena planets Pleiades polar star principal star represented revolve right ascension rise satellites Saturn seasons seen side sidereal revolution Sirius situated small stars solar system solstice southern hemisphere spots Sun's supposed surface Taurus telescope tion triangle Ursa Ursa Major Venus vernal equinox Virgo visible whole number Zeta Zodiac