Fourteen Weeks in Descriptive Astronomy |
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Page 90
... bright enough to cast a shadow at night . If , in addition , at this time of greatest brilliancy , Venus is at or near her high- est north latitude , she may be seen with the naked eye in full daylight . This occurs once in eight years ...
... bright enough to cast a shadow at night . If , in addition , at this time of greatest brilliancy , Venus is at or near her high- est north latitude , she may be seen with the naked eye in full daylight . This occurs once in eight years ...
Page 92
... bright side is toward the sun , and the unillumined side toward us . Indeed , at the period of greatest brilliancy of which we have spoken , only about one - fourth of the light is visible . At this time , however , many observers have ...
... bright side is toward the sun , and the unillumined side toward us . Indeed , at the period of greatest brilliancy of which we have spoken , only about one - fourth of the light is visible . At this time , however , many observers have ...
Page 119
... bright twilight around the heavens in its daily circuit . As the sun sinks lower and lower , this twilight grows gradually fainter , till it fades away . December 21st , the sun is 23 ° 28 ' below the horizon , and this is the midnight ...
... bright twilight around the heavens in its daily circuit . As the sun sinks lower and lower , this twilight grows gradually fainter , till it fades away . December 21st , the sun is 23 ° 28 ' below the horizon , and this is the midnight ...
Page 122
... bright star in the constellation Draco . As the right ascension of the stars is reckoned eastward from the vernal equinox along the equinoctial , the precession of the equinoxes increases the R. A. of the stars 50 " per year . On this ...
... bright star in the constellation Draco . As the right ascension of the stars is reckoned eastward from the vernal equinox along the equinoctial , the precession of the equinoxes increases the R. A. of the stars 50 " per year . On this ...
Page 142
... bright light , will appear much larger than the black one . For the same reason it is often noticed that the crescent moon seems to be a part of a larger circle than the rest of the moon . As we have already said , the moon appears ...
... bright light , will appear much larger than the black one . For the same reason it is often noticed that the crescent moon seems to be a part of a larger circle than the rest of the moon . As we have already said , the moon appears ...
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Common terms and phrases
ancients angle aphelion appearance Aries astronomers atmosphere axis Boötes bright brilliancy calculated Canis Minor Capricornus Cassiopeia centre Cepheus circle colors comet conjunction constellation Cor Caroli density Describe diameter disk double stars earth east ecliptic equal equator equinoctial figure fixed stars globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior conjunction inferior planet Jupiter Kepler latitude length light longitude luminous lunar Lyra magnitude Mars mean distance measured Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune night node north pole orbit Orion pass path penumbra perihelion Perseus Pisces planet rays revolve ring Saturn seasons seen shines side sidereal day solar day solar parallax solar system solstice south pole space spots summer sun's surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity vernal equinox visible winter ZODIACAL ZODIACAL LIGHT
Popular passages
Page 6 - One God, one law, one element, And one far-off divine event, To which the whole creation moves.
Page 127 - ... while the Earth remaineth seed-time and harvest, and cold and heat, and summer and winter, and day and night shall not cease.
Page 259 - 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 220 - Her nails are sharpen'd into pointed claws, Her hands bear half her weight, and turn to paws ; Her lips, that once could tempt a god, begin To grow distorted in an ugly grin. And...
Page 263 - 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 34 - Law of gravitation: Every particle of matter in the universe attracts every other particle with a force varying directly as the product of their masses and inversely as the square of the distance between them.
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 131 - Were it not for the reflective and scattering power of the atmosphere, no objects would be visible to us out of direct sunshine; every shadow of a passing cloud would be pitchy darkness ; the stars would be visible all day, and every apartment, into which the sun had not direct admission, would be involved in nocturnal obscurity.
Page 186 - 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.