Fourteen Weeks in Descriptive Astronomy |
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Page 50
... spots , somewhat as shown in the accompanying figure . Curious opinions concerning solar spots . - The nat- ural purity of the sun seems to have been formerly an article of faith among astronomers , and therefore on no account to be ...
... spots , somewhat as shown in the accompanying figure . Curious opinions concerning solar spots . - The nat- ural purity of the sun seems to have been formerly an article of faith among astronomers , and therefore on no account to be ...
Page 51
... spots are the faults of your glasses or your own eyes . " Fig . 5 X SUN IN TELESCOPE . Discovery of the solar spots . - They seem to have been noticed as early as 807 A. D. , although the tel- escope was not invented until 1610 , and ...
... spots are the faults of your glasses or your own eyes . " Fig . 5 X SUN IN TELESCOPE . Discovery of the solar spots . - They seem to have been noticed as early as 807 A. D. , although the tel- escope was not invented until 1610 , and ...
Page 52
... spots . - Sometimes , but rarely , the disk is clear . During a period of ten years , observations were made on 1982 days , on 372 of which there were no spots seen . As many as two hundred spots have been noticed at one time . They are ...
... spots . - Sometimes , but rarely , the disk is clear . During a period of ten years , observations were made on 1982 days , on 372 of which there were no spots seen . As many as two hundred spots have been noticed at one time . They are ...
Page 53
... 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 a common movement . About fourteen days are required for a spot to pass across the disk of the ...
... 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 a common movement . About fourteen days are required for a spot to pass across the disk of the ...
Page 54
... spots change their rapidity and apparent form as they pass across the disk . - A spot is seen on the eastern limb ; day by day it progresses , with a grad- ually increasing rapidity , until it reaches the cen- Fig . 7 . 00 CHANGE IN SPOTS ...
... spots change their rapidity and apparent form as they pass across the disk . - A spot is seen on the eastern limb ; day by day it progresses , with a grad- ually increasing rapidity , until it reaches the cen- Fig . 7 . 00 CHANGE IN SPOTS ...
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Common terms and phrases
ancients Andromeda angle aphelion appear Aries astronomers atmosphere axis Boötes bright brilliant Canis Minor Capricornus Cassiopeia cause Celestial Sphere centre Cepheus circle color comet conjunction constellation Cor Caroli dark density Describe diameter disk 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 polar Polaris precession rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space 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