Fourteen Weeks in Descriptive Astronomy |
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Page 52
... length of the straggling group being generally par- allel to the equator . " The size of the spots . It is not uncommon to find a spot with a surface larger than that of the earth . / Schröter measured one more than 29,000 miles in ...
... length of the straggling group being generally par- allel to the equator . " The size of the spots . It is not uncommon to find a spot with a surface larger than that of the earth . / Schröter measured one more than 29,000 miles in ...
Page 65
... length of its year , duration of day and night , · temperature of the climate , the number of its moons , and many other interesting facts , showing how much we can now of its world - life in spite of its wonder- ful distance . We shall ...
... length of its year , duration of day and night , · temperature of the climate , the number of its moons , and many other interesting facts , showing how much we can now of its world - life in spite of its wonder- ful distance . We shall ...
Page 66
... earth ; but their days are of dif- ferent lengths from our own . 6. Agreeably to the principles of gravitation , their velocity is greatest at those parts of their orbit which are nearest the sun , and least at the 66 THE SOLAR SYSTEM .
... earth ; but their days are of dif- ferent lengths from our own . 6. Agreeably to the principles of gravitation , their velocity is greatest at those parts of their orbit which are nearest the sun , and least at the 66 THE SOLAR SYSTEM .
Page 67
... length of the day of the interior planets , is much longer than that of the exterior ; the average in the former case being about twenty - four hours , but in the latter only about ten hours . THE PROPERTIES OF THE ELLIPSE . - In the ...
... length of the day of the interior planets , is much longer than that of the exterior ; the average in the former case being about twenty - four hours , but in the latter only about ten hours . THE PROPERTIES OF THE ELLIPSE . - In the ...
Page 85
... length of the Mercurial day is nearly the same as that of the terrestrial one . Though Mercury thus completes a sidereal revolu- tion around the sun in 88 days , yet to pass from one inferior or superior conjunction to the same again ...
... length of the Mercurial day is nearly the same as that of the terrestrial one . Though Mercury thus completes a sidereal revolu- tion around the sun in 88 days , yet to pass from one inferior or superior conjunction to the same again ...
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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