Fourteen Weeks Course in Descriptive Astronomy |
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Page 54
... . These changes can be accounted for only on the supposition that the sun revolves on its axis : indeed , they are the precise effects which the laws of perspective demand in that case . About twenty. 54 THE SOLAR SYSTEM .
... . These changes can be accounted for only on the supposition that the sun revolves on its axis : indeed , they are the precise effects which the laws of perspective demand in that case . About twenty. 54 THE SOLAR SYSTEM .
Page 75
... effect is changed . To an observer at the sun all the motions would be real , while to us many are only apparent . The position of a planet , as seen from the centre of the sun , is called its heliocentric place ; as seen from the ...
... effect is changed . To an observer at the sun all the motions would be real , while to us many are only apparent . The position of a planet , as seen from the centre of the sun , is called its heliocentric place ; as seen from the ...
Page 95
... effect of shadows cast by mountains . Spots have been noticed on its disk which are considered to be traceable to clouds . Indeed , Herschel thinks that we never see the real body of the planet , but only its atmosphere loaded with ...
... effect of shadows cast by mountains . Spots have been noticed on its disk which are considered to be traceable to clouds . Indeed , Herschel thinks that we never see the real body of the planet , but only its atmosphere loaded with ...
Page 121
... effect is called the Precession of the Equinoxes , because the position of the equinoxes in any year precedes that which they occupied the year before . Since the circle of the ecliptic is divided into 360 ° , it follows that the time ...
... effect is called the Precession of the Equinoxes , because the position of the equinoxes in any year precedes that which they occupied the year before . Since the circle of the ecliptic is divided into 360 ° , it follows that the time ...
Page 125
... effect . We have seen that if the earth had no rotation , the sun's attraction on the " padding " at the equator would bring CP nearer to C Q , but that in consequence of this rotation the effect really produced is that CP , the earth's ...
... effect . We have seen that if the earth had no rotation , the sun's attraction on the " padding " at the equator would bring CP nearer to C Q , but that in consequence of this rotation the effect really produced is that CP , the earth's ...
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Common terms and phrases
ancients aphelion appear Aries astronomers atmosphere axis Boötes bright brilliant Canis Minor Capricornus Cassiopeia cause celestial Celestial Sphere centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk Draco earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior conjunction inferior planet Jupiter latitude length light luminous lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon's motion move naked eye nearly nebula Neptune night node north pole Orion parallax pass path penumbra perihelion Perseus Pisces Polaris precession rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space sphere spots summer sun's surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible winter Zodiac
Popular passages
Page 6 - One God, one law, one element, And one far-off divine event, To which the whole creation moves.
Page 129 - ... while the Earth remaineth seed-time and harvest, and cold and heat, and summer and winter, and day and night shall not cease.
Page 283 - That nothing walks with aimless feet ; That not one life shall be destroyed, Or cast as rubbish to the void, When God hath made the pile complete...
Page 289 - A solar day is the interval between two successive passages of the sun across the meridian of any place. If the earth were stationary in its orbit, the solar day would be of the same length as the sidereal ; but while the earth is turning around on its axis, it is going forward at the rate a'i 360° in a year, or about 1° per day.
Page 29 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Page 29 - If you forgive me, I rejoice ; if you are angry, I can bear it. The die is cast, the book is written, to be read either now or by posterity, I care not which. It may well wait a century for a reader, as God has waited six thousand years for an observer.
Page 192 - We see it as Columbus saw America from the shores of Spain. Its movements have been felt, trembling along the far-reaching line of our analysis, with a certainty hardly inferior to that of ocular demonstration.
Page 31 - Nature, such as the seven metals, &,c., which it were tedious to enumerate, we gather that the number of planets is necessarily seven. Moreover, the satellites are invisible to the naked eye, and therefore can exercise no influence over the earth, and therefore would be useless, and therefore do not exist.
Page 20 - All these facts were attempted to be accounted for by an incongruous system of " cycles and epicycles," as it is called. The advocates of this theory assumed that every planet revolves in a circle, and that the earth is the fixed centre around which the sun and the heavenly bodies move. They then conceived that a bar, or something equivalent, is connected at one end with the earth ; that at some part of this bar the sun is attached ; while between that and the earth, Venus is fastened — not to...
Page 206 - Threat'ning the world with famine, plague, and war ; To princes, death ; to kingdoms, many crosses ; To all estates, inevitable losses ; To herdsmen, rot ; to ploughmen, hapless seasons ; To sailors, storms ; to cities, civil treasons.