Fourteen Weeks in Descriptive Astronomy |
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Page 91
... months . This is a sidereal revolu- tion , as it would appear to an observer at the sun , but a synodic revolution is 584 days . Mercury , we remember , catches up with the earth in 28 days after it reaches the point where it left the ...
... months . This is a sidereal revolu- tion , as it would appear to an observer at the sun , but a synodic revolution is 584 days . Mercury , we remember , catches up with the earth in 28 days after it reaches the point where it left the ...
Page 107
... months . - This is the natural result of the revolu- tion of the earth about the sun . In Fig . 30 , suppose Fig . 80 . H E * * * ***** D B * APPEARANCE OF THE HEAVENS IN DIFFERENT SEASONS . ABCD to be the orbit of the earth , and ...
... months . - This is the natural result of the revolu- tion of the earth about the sun . In Fig . 30 , suppose Fig . 80 . H E * * * ***** D B * APPEARANCE OF THE HEAVENS IN DIFFERENT SEASONS . ABCD to be the orbit of the earth , and ...
Page 108
... months the earth has passed over one - fourth of her orbit , and has arrived at B. Stars about F now appear on the meridian at midnight . while those at E , which previously occupied their places , have descended toward the west and are ...
... months the earth has passed over one - fourth of her orbit , and has arrived at B. Stars about F now appear on the meridian at midnight . while those at E , which previously occupied their places , have descended toward the west and are ...
Page 113
... months elapse the earth is now in Cancer and the sun in Capricornus ; and he is overhead , 231 ° south of the equator . His rays strike less obliquely in the southern hemisphere than before , but in the northern hemisphere more ...
... months elapse the earth is now in Cancer and the sun in Capricornus ; and he is overhead , 231 ° south of the equator . His rays strike less obliquely in the southern hemisphere than before , but in the northern hemisphere more ...
Page 114
... months polar day . The reverse is true at the Antarctic Circle , and it is there the midnight of the long six months polar night . IX . The earth at the Autumnal Equinox . - The earth crosses the aphelion point the 1st of July , when it ...
... months polar day . The reverse is true at the Antarctic Circle , and it is there the midnight of the long six months polar night . IX . The earth at the Autumnal Equinox . - The earth crosses the aphelion point the 1st of July , when it ...
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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