Fourteen Weeks in Descriptive Astronomy |
From inside the book
Results 6-10 of 71
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- nally increasing rapidity , until it reaches the cen- Fig . 7 . 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- nally increasing rapidity , until it reaches the cen- Fig . 7 . CHANGE IN SPOTS AS THEY CROSS THE DISK . tre ; it now gradually loses its rapidity , and finally ...
Page 71
... must have been afterward calculated and chronicled in their records . VENTS AND JUPITER IN CONJUNCTION , JANUARY 30 , 1868 . SIZE OF SUN AS SEEN FROM THE PLANETS . 2,000. THE PLANETS . 71 COMETS TABLE OF CONTENTS PAGE.
... must have been afterward calculated and chronicled in their records . VENTS AND JUPITER IN CONJUNCTION , JANUARY 30 , 1868 . SIZE OF SUN AS SEEN FROM THE PLANETS . 2,000. THE PLANETS . 71 COMETS TABLE OF CONTENTS PAGE.
Page 73
... 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 ORBIT AND SEASONS OF MERCURY. 4 THE PLANETS . 73.
... 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 ORBIT AND SEASONS OF MERCURY. 4 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 ...
Other editions - View all
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