Fourteen Weeks in Descriptive Astronomy |
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Page 60
... appear , which constitute the most brilliant por- tions of the sun . These are called fa- culo . They vary FACULE . from barely discern- ible , softly - gleaming tracts 1,000 miles long , to lofty , piled - up , mountain- ous regions ...
... appear , which constitute the most brilliant por- tions of the sun . These are called fa- culo . They vary FACULE . from barely discern- ible , softly - gleaming tracts 1,000 miles long , to lofty , piled - up , mountain- ous regions ...
Page 61
... 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.
... 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 64
... appear as black spots on the sun's disk . A cloud once formed becomes a screen to shield the upper regions from the direct heat of the body of the sun . Thus a lighter cloud is produced , which gives the appear- ance of a penumbra ...
... appear as black spots on the sun's disk . A cloud once formed becomes a screen to shield the upper regions from the direct heat of the body of the sun . Thus a lighter cloud is produced , which gives the appear- ance of a penumbra ...
Page 75
... appear to him if viewed from the earth . MOTIONS OF AN INFERIOR PLANET . - An inferior planet is never seen by us in the part of the sky opposite to the sun at the time of observation . It cannot recede from him as much as 90 ° , or the ...
... appear to him if viewed from the earth . MOTIONS OF AN INFERIOR PLANET . - An inferior planet is never seen by us in the part of the sky opposite to the sun at the time of observation . It cannot recede from him as much as 90 ° , or the ...
Page 77
... appears to us as a round black spot swiftly moving across his disk . This is called a transit . Fig . 20 . G A RETROGRADE MOTION . Retrograde motion of an inferior planet . Suppose the earth to be at A , and the planet at B. Now , while ...
... appears to us as a round black spot swiftly moving across his disk . This is called a transit . Fig . 20 . G A RETROGRADE MOTION . Retrograde motion of an inferior planet . Suppose the earth to be at A , and the planet at B. Now , while ...
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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