Fourteen Weeks in Descriptive Astronomy |
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Page 53
... umbra itself has generally a dense black centre , called the nucleus . Besides Fig . 6 . SUN SPOTS . this , the umbra is sometimes divided by luminous bridges . The spots are in motion . - They change from day to day ; but they all have ...
... umbra itself has generally a dense black centre , called the nucleus . Besides Fig . 6 . SUN SPOTS . this , the umbra is sometimes divided by luminous bridges . The spots are in motion . - They change from day to day ; but they all have ...
Page 61
... , " which appears to slowly increase and as- sume the blackness of an umbra , after which the penumbra begins to appear . PHYSICAL CONSTITUTION OF THE SUN . - Of the consti- tution of the sun , and consequent cause of the. THE SUN .. 61.
... , " which appears to slowly increase and as- sume the blackness of an umbra , after which the penumbra begins to appear . PHYSICAL CONSTITUTION OF THE SUN . - Of the consti- tution of the sun , and consequent cause of the. THE SUN .. 61.
Page 155
... ( umbra ) of Fig . 48 S UMBRA AND PENUMBRA . the moon falls on the earth and obscures the entire body of the sun . To the persons within that region there is a total eclipse ; the breadth of this ECLIPSES . 155 ECLIPSES.
... ( umbra ) of Fig . 48 S UMBRA AND PENUMBRA . the moon falls on the earth and obscures the entire body of the sun . To the persons within that region there is a total eclipse ; the breadth of this ECLIPSES . 155 ECLIPSES.
Page 156
... umbra there is a lighter shadow , penumbra ( pene , almost -- umbra , a shadow ) , where only a portion of the sun's disk is obscured . Within this region there is a partial eclipse . To those persons liv- ing north of the equator and ...
... umbra there is a lighter shadow , penumbra ( pene , almost -- umbra , a shadow ) , where only a portion of the sun's disk is obscured . Within this region there is a partial eclipse . To those persons liv- ing north of the equator and ...
Page 162
... umbra is represented by the space between the lines Kc and Ib ; outside of this is the penumbra , where the earth ... umbra ; she then emerges from the umbra at c , —which is called the second con- tact with the umbra ; finally , she ...
... umbra is represented by the space between the lines Kc and Ib ; outside of this is the penumbra , where the earth ... umbra ; she then emerges from the umbra at c , —which is called the second con- tact with the umbra ; finally , she ...
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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.