Fourteen Weeks in Descriptive Astronomy |
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Page 20
... appear to be entirely station- ary ; then she would retrace her steps , and seem to meet the sun . All these facts were attempted to be accounted for by an incongruous system of " cycles and epicycles , " as it is called . The advo ...
... appear to be entirely station- ary ; then she would retrace her steps , and seem to meet the sun . All these facts were attempted to be accounted for by an incongruous system of " cycles and epicycles , " as it is called . The advo ...
Page 30
... appear near . With his profound knowledge of optics and philosophical instruments , Galileo instantly caught the idea , and soon had a telescope completed that would magnify thirty times . It was a very simple affair - only a piece of ...
... appear near . With his profound knowledge of optics and philosophical instruments , Galileo instantly caught the idea , and soon had a telescope completed that would magnify thirty times . It was a very simple affair - only a piece of ...
Page 35
... appears to be spread above us , is termed the Celestial Sphere . There are two points to be no- ticed here . First ... appear to pierce the sphere at the same point ; which is to say , that at that enormous distance , 183,000,000 miles ...
... appears to be spread above us , is termed the Celestial Sphere . There are two points to be no- ticed here . First ... appear to pierce the sphere at the same point ; which is to say , that at that enormous distance , 183,000,000 miles ...
Page 48
... appears to be about a half de- gree in diameter , so that 360 disks like the sun , laid side by side , would make a half circle of the celestial sphere . It seems a little larger to us in winter than in summer , as we are 3,000,000 ...
... appears to be about a half de- gree in diameter , so that 360 disks like the sun , laid side by side , would make a half circle of the celestial sphere . It seems a little larger to us in winter than in summer , as we are 3,000,000 ...
Page 50
... appear to us perfectly distinct and circular , and with no spot to dim its brightness . If we use , however , a telescope of moderate power , taking the precaution to properly shield the eye with a colored eye - piece , we shall find ...
... appear to us perfectly distinct and circular , and with no spot to dim its brightness . If we use , however , a telescope of moderate power , taking the precaution to properly shield the eye with a colored eye - piece , we shall find ...
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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