Fourteen Weeks in Descriptive Astronomy |
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Page 29
... MEAN DISTANCES FROM THE SUN . * In rapture over the discovery of these three laws , so marked by that divine simplicity which pervades all the laws of nature , Kepler exclaimed , " Nothing holds me . The die is cast . The book is ...
... MEAN DISTANCES FROM THE SUN . * In rapture over the discovery of these three laws , so marked by that divine simplicity which pervades all the laws of nature , Kepler exclaimed , " Nothing holds me . The die is cast . The book is ...
Page 48
... average ( mean ) distance by 1000 , the same sur- face will be represented to us when in aphelion ( July ) by 940 , and when in perihelion ( January ) by 1072 . DIMENSIONS . - Its diameter is about 850,000 miles . * Let us try to ...
... average ( mean ) distance by 1000 , the same sur- face will be represented to us when in aphelion ( July ) by 940 , and when in perihelion ( January ) by 1072 . DIMENSIONS . - Its diameter is about 850,000 miles . * Let us try to ...
Page 67
... distance from that luminary . 2. The average density of the first group consid- erably exceeds that of the second , the approximate ratio being 5 : 1 . 3. The mean duration of the axial rotations , or mean length of the day of the ...
... distance from that luminary . 2. The average density of the first group consid- erably exceeds that of the second , the approximate ratio being 5 : 1 . 3. The mean duration of the axial rotations , or mean length of the day of the ...
Page 68
... mean distance , OB the semi - axis - minor : the ratio of OS to OA is the eccentricity ; the least distance , SA , is the perihelion distance ; the greatest distance , SC , the aphelion distance . Fig . 14 . S D AN ELLIPSE ...
... mean distance , OB the semi - axis - minor : the ratio of OS to OA is the eccentricity ; the least distance , SA , is the perihelion distance ; the greatest distance , SC , the aphelion distance . Fig . 14 . S D AN ELLIPSE ...
Page 85
... mean distance of 35,000,000 miles . Its orbit is the most eccentric ( flattened ) of any among the eight principal planets , so that although when in peri- helion it approaches to within 28,000,000 miles , in aphelion it speeds away ...
... mean distance of 35,000,000 miles . Its orbit is the most eccentric ( flattened ) of any among the eight principal planets , so that although when in peri- helion it approaches to within 28,000,000 miles , in aphelion it speeds away ...
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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