Fourteen Weeks in Descriptive Astronomy |
From inside the book
Results 1-5 of 8
Page 53
... umbra itself has generally a dense black centre , called the nucleus . Besides Fig . 6 . SUN 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 ...
... umbra itself has generally a dense black centre , called the nucleus . Besides Fig . 6 . SUN 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 ...
Page 61
... , " which appears to slowly increase and as- sume the blackness of an umbra , after which the penumbra begins to appear . PHYSICAL CONSTITUTION OF THE SUN . - Of the consti- tution of the sun , and consequent cause of the. THE SUN . 61.
... , " which appears to slowly increase and as- sume the blackness of an umbra , after which the penumbra begins to appear . PHYSICAL CONSTITUTION OF THE SUN . - Of the consti- tution of the sun , and consequent cause of the. THE SUN . 61.
Page 155
... ( umbra ) of Fig . 48 ន UMBRA AND PENUMBRA . the moon falls on the earth and obscures the entire body of the sun . To the persons within that region there is a total eclipse ; the breadth of this ECLIPSES . 155 ECLIPSES •
... ( umbra ) of Fig . 48 ន UMBRA AND PENUMBRA . the moon falls on the earth and obscures the entire body of the sun . To the persons within that region there is a total eclipse ; the breadth of this ECLIPSES . 155 ECLIPSES •
Page 156
... umbra there is a lighter shadow , penumbra ( pene , almost -- umbra , a shadow ) , where only . a portion of the sun's disk is obscured . Within this region there is a partial eclipse . To those persons liv- ing north of the equator and ...
... umbra there is a lighter shadow , penumbra ( pene , almost -- umbra , a shadow ) , where only . a portion of the sun's disk is obscured . Within this region there is a partial eclipse . To those persons liv- ing north of the equator and ...
Page 162
... umbra is represented by the space between the lines Kc and Ib ; outside of this is the penumbra , where the earth ... umbra ; she then emerges from the umbra at c , -which is called the second con- tact with the umbra ; finally , she ...
... umbra is represented by the space between the lines Kc and Ib ; outside of this is the penumbra , where the earth ... umbra ; she then emerges from the umbra at c , -which is called the second con- tact with the umbra ; finally , she ...
Other editions - View all
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