Fourteen Weeks in Descriptive Astronomy |
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Page 50
... surface is so far from its centre that the attraction is largely diminished , since that decreases , we remember , as the square of the distance . However , a man weighing at the earth's equator 150 lbs . , at the sun's equator would ...
... surface is so far from its centre that the attraction is largely diminished , since that decreases , we remember , as the square of the distance . However , a man weighing at the earth's equator 150 lbs . , at the sun's equator would ...
Page 52
... surface larger than that of the earth . Schröter measured one more than 29,000 miles in diameter . Sir J. W. Herschel calculated that one which he saw was 50,000 miles in diameter . In 1843 one was seen which was 14,816 miles across ...
... surface larger than that of the earth . Schröter measured one more than 29,000 miles in diameter . Sir J. W. Herschel calculated that one which he saw was 50,000 miles in diameter . In 1843 one was seen which was 14,816 miles across ...
Page 57
... surface with fearful rapidity , producing rotation and sudden changes in the spots . At other times , however , the spots seem " to set sail and move across the disk of the sun like gondolas over a silver sea . " The spots change their ...
... surface with fearful rapidity , producing rotation and sudden changes in the spots . At other times , however , the spots seem " to set sail and move across the disk of the sun like gondolas over a silver sea . " The spots change their ...
Page 58
... surface , breaking into pieces , and sliding off in every direction . Sometimes one divides itself into several nuclei , while again several nuclei com- bine into one . Occasionally a spot will remain for six or eight rotations , while ...
... surface , breaking into pieces , and sliding off in every direction . Sometimes one divides itself into several nuclei , while again several nuclei com- bine into one . Occasionally a spot will remain for six or eight rotations , while ...
Page 59
... surface.- It seems that the breaking out of a spot sensibly diminishes the temperature of that portion of the sun's disk . The faculæ , on the other hand , do not increase the temperature . ( Secchi . ) The spots are depressions below ...
... surface.- It seems that the breaking out of a spot sensibly diminishes the temperature of that portion of the sun's disk . The faculæ , on the other hand , do not increase the temperature . ( Secchi . ) The spots are depressions below ...
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Common terms and phrases
ancients Andromeda angle aphelion appearance Aries astronomers atmosphere axis body Boötes bright brilliant Canis Minor Capricornus Cassiopeia celestial 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 heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light lunar Lyra magnitude Mars mean distance Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune node north pole orbit Orion parallax pass path penumbra perihelion Perseus Pisces planet Polaris precession rays revolve ring rising Saturn seasons seen shadow shines shower sidereal sidereal day solar day solar system space spots summer sun's superior planet surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible zodiac