Fourteen Weeks Course in Descriptive Astronomy |
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Page 12
... SIDEREAL SYSTEM . • 219 THE STARS • 221 THE CONSTELLATIONS NORTHERN CIRCUMPOLAR CONSTELLATIONS • 234 234 EQUATORIAL CONSTELLATIONS · 242 263 SOUTHERN CONSTELLATIONS DOUBLE STARS , COLORED STARS , VARIABLE STARS , CLUSTERS , MAGELLANIC ...
... SIDEREAL SYSTEM . • 219 THE STARS • 221 THE CONSTELLATIONS NORTHERN CIRCUMPOLAR CONSTELLATIONS • 234 234 EQUATORIAL CONSTELLATIONS · 242 263 SOUTHERN CONSTELLATIONS DOUBLE STARS , COLORED STARS , VARIABLE STARS , CLUSTERS , MAGELLANIC ...
Page 15
... sidereal journeys , marking their paths to a nicety of which we can scarcely conceive , and at last it has analyzed the structure of the sun and far - off stars , announ- cing the very elements of which they are composed . Observing for ...
... sidereal journeys , marking their paths to a nicety of which we can scarcely conceive , and at last it has analyzed the structure of the sun and far - off stars , announ- cing the very elements of which they are composed . Observing for ...
Page 40
... Sidereal Clock , and Chronographs of the best Observatories . III . THE ECLIPTIC SYSTEM . ( a ) The PRINCIPAL CIRCLE is the Ecliptic . This is the earth's orbit about the sun , or the apparent path of the sun in the heavens . It is ...
... Sidereal Clock , and Chronographs of the best Observatories . III . THE ECLIPTIC SYSTEM . ( a ) The PRINCIPAL CIRCLE is the Ecliptic . This is the earth's orbit about the sun , or the apparent path of the sun in the heavens . It is ...
Page 55
... SIDEREAL REVOLUTION . Synodic and sidereal revolution of the spots . - We can easily understand why we make an allowance for the motion of the earth in its orbit . Suppose a solar spot at a , on a line passing from THE SUN . 55.
... SIDEREAL REVOLUTION . Synodic and sidereal revolution of the spots . - We can easily understand why we make an allowance for the motion of the earth in its orbit . Suppose a solar spot at a , on a line passing from THE SUN . 55.
Page 56
... sidereal revolution . The spots apparently do not always move in straight lines . Sometimes their path curves toward MARCH . JUNE . SEPTEMBER . Fig . 9 . the north , and sometimes toward the south , as in the figure . This can be ...
... sidereal revolution . The spots apparently do not always move in straight lines . Sometimes their path curves toward MARCH . JUNE . SEPTEMBER . Fig . 9 . the north , and sometimes toward the south , as in the figure . This can be ...
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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.