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 M 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.
... ( umbra ) of Fig . 48 S M 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.
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 Andromeda angle aphelion appearance Aries astronomer atmosphere axis beautiful Boötes bright brilliant Canis Minor Capricornus Cassiopeia celestial centre Cepheus circle color comet constellation Cor Caroli dark density Describe diameter disk double stars earth east ecliptic equal equator equinoctial figure fixed stars globe heat heavens Hercules Herschel horizon inferior inferior conjunction inferior planet Jupiter latitude length light longitude luminous lunar Lyra Mars mean distance measured Mercury meridian meteors miles moon moon's motion move Mythological naked eye named nebula Neptune night node north pole orbit Orion pass path perihelion Perseus Pisces planet Polaris rays revolve ring Saturn seasons seen shine sidereal sidereal day Sirius small stars solar day solar system solstice space sphere spots summer sun's surface synodic revolution tail tance Taurus telescope theory tion triangle Uranus Ursa Major Ursa Minor vary 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 251 - Back comes the Chief in triumph. Who, in the hour of fight, Hath seen the Great Twin Brethren In harness on his right. Safe comes the ship to haven, Through billows and through gales, If once the Great Twin Brethren Sit shining on the sails.
Page 289 - A solar day is the interval between two successive passages of the sun across the meridian of any place.
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 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 251 - Orion is represented under the figure of a hunter assaulting Taurus. He has a sword in his belt, a club in his right hand, and the skin of a lion in his left.
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 119 - ... of September. On this day it slowly sweeps around the sky, with its face half hidden below the icy sea. It still continues to descend ; and, after it has entirely disappeared, it is still so near the horizon that it carries a 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.
Page 99 - Sadler, the celebrated aeronaut, ascended on one occasion in a balloon from Dublin, and was wafted across the Irish Channel, when, on his approach to the Welsh coast, the balloon descended nearly to the surface of the sea. By this time the sun was set, and the shades of evening began to close in. He threw out nearly all his ballast, and suddenly sprang upward to a great height, and by so doing brought his horizon to dip below the sun, producing the whole phenomenon of a western sunrise. Subsequently...