Fourteen Weeks in Descriptive Astronomy |
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Page 30
... turned the telescope toward Jupiter . Near it he saw three bright stars , as he considered them , which were invisible to the naked eye . The next night he noticed that those stars had changed their relative positions . Aston- ished and ...
... turned the telescope toward Jupiter . Near it he saw three bright stars , as he considered them , which were invisible to the naked eye . The next night he noticed that those stars had changed their relative positions . Aston- ished and ...
Page 34
... turned his attention to the sun , and , by reasoning equally conclusive , proved that the attrac- tion of that great central orb compels all the planets to revolve about it in elliptical orbits , and holds them with an irresistible ...
... turned his attention to the sun , and , by reasoning equally conclusive , proved that the attrac- tion of that great central orb compels all the planets to revolve about it in elliptical orbits , and holds them with an irresistible ...
Page 45
... attraction of all the planets , and compel them to circle around him ; next , the planets , each turning on its axis while it flies around the sun in an elliptical orbit ; then , accompanying these THE PLANETS VULCAN MERCURY VENUS.
... attraction of all the planets , and compel them to circle around him ; next , the planets , each turning on its axis while it flies around the sun in an elliptical orbit ; then , accompanying these THE PLANETS VULCAN MERCURY VENUS.
Page 58
... turned away for a moment , and on looking back it was gone . The appearance of the spots is periodical . - It is a re- markable fact that the number of spots increases and diminishes through a regular interval of about 11.11 years ...
... turned away for a moment , and on looking back it was gone . The appearance of the spots is periodical . - It is a re- markable fact that the number of spots increases and diminishes through a regular interval of about 11.11 years ...
Page 78
... turned to- ward us ; but the planet is lost in the sun's rays : therefore neither Mercury nor Venus ever presents a full circular appearance , like the full moon . A little before or after superior conjunction , an inferior Fig . 21 . E ...
... turned to- ward us ; but the planet is lost in the sun's rays : therefore neither Mercury nor Venus ever presents a full circular appearance , like the full moon . A little before or after superior conjunction , an inferior Fig . 21 . E ...
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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