Fourteen Weeks in Descriptive Astronomy |
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Page 83
... horizon . Its elevation increases evening by evening , but never exceeds 30 ° . * If we watch it closely , we shall find that it again ap- * This distance varies much , owing to the eccentricity of Mer- cury's orbit . proaches the sun ...
... horizon . Its elevation increases evening by evening , but never exceeds 30 ° . * If we watch it closely , we shall find that it again ap- * This distance varies much , owing to the eccentricity of Mer- cury's orbit . proaches the sun ...
Page 87
... horizon at one solstice , and as far toward the northern hori- zon at the other . The equatorial regions , there- fore , modify their temperature during each rev- Sumger Solstice Spring 40 99 Vernal Equinox umta er Winter Winter ...
... horizon at one solstice , and as far toward the northern hori- zon at the other . The equatorial regions , there- fore , modify their temperature during each rev- Sumger Solstice Spring 40 99 Vernal Equinox umta er Winter Winter ...
Page 88
... horizon , but , on account of Mercury's elliptical orbit , when in perihelion the planet approaches so near the sun that the heat and light are ten times as great as that we receive , while in aphelion it recedes so as to reduce the ...
... horizon , but , on account of Mercury's elliptical orbit , when in perihelion the planet approaches so near the sun that the heat and light are ten times as great as that we receive , while in aphelion it recedes so as to reduce the ...
Page 89
Joel Dorman Steele. always hanging around our horizon , this planet has not received much attention of late ; the cuts here given , and the remarks concerning its physical fea- tures , are based upon the observations of the older ...
Joel Dorman Steele. always hanging around our horizon , this planet has not received much attention of late ; the cuts here given , and the remarks concerning its physical fea- tures , are based upon the observations of the older ...
Page 99
... horizon expands as we ascend an eminence . * If we climb to the top of a hill , we can see further than when on the plain at its foot . Our eyesight is not improved ; it is only because ordinarily the curvature of the earth shuts off ...
... horizon expands as we ascend an eminence . * If we climb to the top of a hill , we can see further than when on the plain at its foot . Our eyesight is not improved ; it is only because ordinarily the curvature of the earth shuts off ...
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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