Fourteen Weeks in Descriptive Astronomy |
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Page 156
... 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 of the umbra , the eclipse ...
... 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 of the umbra , the eclipse ...
Page 157
... shadow is too small to enshroud the entire globe , so that the region in which it is total cannot exceed 180 miles in breadth . As , however , the earth is con- stantly revolving on its axis during the duration of the eclipse , the shadow ...
... shadow is too small to enshroud the entire globe , so that the region in which it is total cannot exceed 180 miles in breadth . As , however , the earth is con- stantly revolving on its axis during the duration of the eclipse , the shadow ...
Page 181
... shadow , as it were , and so its light is much diminished . Through a telescope we can distinctly watch the disappearance or immersion of the satellites in the planet's shadow , their reappearance or emersion , and also their transits ...
... shadow , as it were , and so its light is much diminished . Through a telescope we can distinctly watch the disappearance or immersion of the satellites in the planet's shadow , their reappearance or emersion , and also their transits ...
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Common terms and phrases
ancients angle aphelion appear astronomers atmosphere axis bright brilliant called Capricornus Cassiopeia Celestial Sphere centre circle color comet conjunction constellation Cor Caroli dark density diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light longitude luminous lunar magnitude Mars mean distance measured Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune night node north pole obliquity observer orbit parallax pass path penumbra perihelion Perseus planet polar position rays revolve Right Ascension ring rotation satellites Saturn seasons seen shadow shine side sidereal sidereal day solar system space spots summer sun's superior planet supposed surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major varies velocity Venus vernal equinox visible zenith zodiac