Fourteen Weeks in Descriptive Astronomy |
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Page 48
... disks like the sun , laid side by side , would make a half circle of the celestial sphere . It seems a little larger to us in winter than in summer , as we are 3,000,000 miles nearer it . If we represent the luminous surface of the sun ...
... disks like the sun , laid side by side , would make a half circle of the celestial sphere . It seems a little larger to us in winter than in summer , as we are 3,000,000 miles nearer it . If we represent the luminous surface of the sun ...
Page 50
... disk will appear to us perfectly distinct and circular , and with no spot to dim its brightness . If we use , however , a telescope of moderate power , taking the precaution to properly shield the eye with a colored eye - piece , we ...
... disk will appear to us perfectly distinct and circular , and with no spot to dim its brightness . If we use , however , a telescope of moderate power , taking the precaution to properly shield the eye with a colored eye - piece , we ...
Page 52
... 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 found in two belts , one on each side ...
... 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 found in two belts , one on each side ...
Page 53
... 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 sun from the eastern side. THE SUN . 53.
... 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 sun from the eastern side. THE SUN . 53.
Page 54
... 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 AS THEY CROSS THE DISK . tre ; it now gradually loses its rapidity ...
... 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 AS THEY CROSS THE DISK . tre ; it now gradually loses its rapidity ...
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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