Fourteen Weeks in Descriptive Astronomy |
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Page 30
... telescope completed that would magnify thirty times . It was a very simple affair - only a piece of lead pipe with glasses set at each end ; but it was the first telescope ever made , and destined to over- throw the old Ptolemaic theory ...
... telescope completed that would magnify thirty times . It was a very simple affair - only a piece of lead pipe with glasses set at each end ; but it was the first telescope ever made , and destined to over- throw the old Ptolemaic theory ...
Page 58
... telescope , he 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 ...
... telescope , he 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 ...
Page 285
... telescopes , with a prism mounted between their object - glasses , in the manner shown in the cut . The rays of light ... telescope is sometimes attached , which contains a minutely accu- rate scale for measuring the distances of the ...
... telescopes , with a prism mounted between their object - glasses , in the manner shown in the cut . The rays of light ... telescope is sometimes attached , which contains a minutely accu- rate scale for measuring the distances of the ...
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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