Fourteen Weeks in Descriptive Astronomy |
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Page 53
... seen that the spots generally consist of one or more dark portions called the umbra , and around that a grayish portion styled the pe- numbra ( pene , almost , and um- bra , black ) .- Sometimes , how- ever , umbræ ap- pear without a ...
... seen that the spots generally consist of one or more dark portions called the umbra , and around that a grayish portion styled the pe- numbra ( pene , almost , and um- bra , black ) .- Sometimes , how- ever , umbræ ap- pear without a ...
Page 54
... 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 , and finally ...
... 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 , and finally ...
Page 70
... Donati's comet of 1858 at 6 miles ; and the nearest fixed star at 7,500 miles . According to this scale , the daily motion of Vulcan. COMPARATIVE SIZE OF PLANETS . SIZE OF SUN AS SEEN FROM THE PLANETS . 2,000. 70 THE SOLAR SYSTEM .
... Donati's comet of 1858 at 6 miles ; and the nearest fixed star at 7,500 miles . According to this scale , the daily motion of Vulcan. COMPARATIVE SIZE OF PLANETS . SIZE OF SUN AS SEEN FROM THE PLANETS . 2,000. 70 THE SOLAR SYSTEM .
Page 73
... conceive of any polar inhabitant who could endure the. SIZE OF SUN AS SEEN FROM THE PLANETS . 2,000 in passing from Mercury to Uranus . No hu- man being could reside on the former , while we Fig . 19 . B. 1 THE PLANETS . 73.
... conceive of any polar inhabitant who could endure the. SIZE OF SUN AS SEEN FROM THE PLANETS . 2,000 in passing from Mercury to Uranus . No hu- man being could reside on the former , while we Fig . 19 . B. 1 THE PLANETS . 73.
Page 75
... seen from the centre of the sun , is called its heliocentric place ; as seen from the centre of the earth , its geocentric place . When Venus is at inferior conjunction , an observer at the sun would see it in the opposite part of the ...
... seen from the centre of the sun , is called its heliocentric place ; as seen from the centre of the earth , its geocentric place . When Venus is at inferior conjunction , an observer at the sun would see it in the opposite part of the ...
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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