Fourteen Weeks in Descriptive Astronomy |
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Page 78
... 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 PHASES OF AN INFERIOR PLANET . W planet may be seen with ...
... 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 PHASES OF AN INFERIOR PLANET . W planet may be seen with ...
Page 79
... rays is invisible to us . Retrograde motion of a superior planet . - Suppose the earth to be at E and the planet at L , and that we move on to G while the planet passes on to 0— the distance EG being longer than LO ( just the reverse of ...
... rays is invisible to us . Retrograde motion of a superior planet . - Suppose the earth to be at E and the planet at L , and that we move on to G while the planet passes on to 0— the distance EG being longer than LO ( just the reverse of ...
Page 83
... 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 and becomes lost in his rays Some MERCURY . 83.
... 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 and becomes lost in his rays Some MERCURY . 83.
Page 84
Joel Dorman Steele. proaches the sun and becomes lost in his rays Some days afterward , just before sunrise , we can see the same star in the east , rising higher each morn- ing , until its greatest elevation equals that which it before ...
Joel Dorman Steele. proaches the sun and becomes lost in his rays Some days afterward , just before sunrise , we can see the same star in the east , rising higher each morn- ing , until its greatest elevation equals that which it before ...
Page 88
... rays , and in a few weeks after sinks far down toward 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 ...
... rays , and in a few weeks after sinks far down toward 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 ...
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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