Fourteen Weeks in Descriptive Astronomy |
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Page 62
... penumbra . This explains a black spot with its penumbra . Sometimes the opening in the photo- sphere may be smaller than that in the inner or cloudy atmosphere ; in that case there will be a black spot without a penumbra . It will be ...
... penumbra . This explains a black spot with its penumbra . Sometimes the opening in the photo- sphere may be smaller than that in the inner or cloudy atmosphere ; in that case there will be a black spot without a penumbra . It will be ...
Page 64
Joel Dorman Steele. penumbra , which , in its turn , will pass from our sight . The existence of an outer atmosphere will ... penumbra around the spots . Spectrum analysis .-- The hypothesis just given of the constitution of the sun rests ...
Joel Dorman Steele. penumbra , which , in its turn , will pass from our sight . The existence of an outer atmosphere will ... penumbra around the spots . Spectrum analysis .-- The hypothesis just given of the constitution of the sun rests ...
Page 162
... penumbra , where the earth cuts off the light of only a portion of the sun . The moon enters the penumbra of the earth at a , -this is termed her first contact with the penumbra ; next she encounters the dark shadow of the earth at b ...
... penumbra , where the earth cuts off the light of only a portion of the sun . The moon enters the penumbra of the earth at a , -this is termed her first contact with the penumbra ; next she encounters the dark shadow of the earth at b ...
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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