Fourteen Weeks in Descriptive Astronomy |
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Page 55
... SIDEREAL REVOLUTION . X Synodic and sidereal revolution of the spots . - We can easily understand why we make an allowance for the motion of the earth in its orbit . Suppose a solar spot at a , on a line passing from THE SUN . 55.
... SIDEREAL REVOLUTION . X Synodic and sidereal revolution of the spots . - We can easily understand why we make an allowance for the motion of the earth in its orbit . Suppose a solar spot at a , on a line passing from THE SUN . 55.
Page 56
... spots apparently do not always move in straight lines . Sometimes their path curves toward MARCH . JUNE . SEPTEMBER ... spots have a motion of their own . - Besides the motion already named as assigned to the sun's rota- tion , the spots ...
... spots apparently do not always move in straight lines . Sometimes their path curves toward MARCH . JUNE . SEPTEMBER ... spots have a motion of their own . - Besides the motion already named as assigned to the sun's rota- tion , the spots ...
Page 57
... spots . At other times , however , the spots seem to set sail and move across the disk of the sun like gondolas over a silver sea . " 66 The spots change their real form . - Spots break out and then disappear under the very eye of the ...
... spots . At other times , however , the spots seem to set sail and move across the disk of the sun like gondolas over a silver sea . " 66 The spots change their real form . - Spots break out and then disappear under the very eye of the ...
Page 58
... spot through his telescope , he turned away for a moment , and on looking back it was gone . X The appearance of the spots is periodical . — It is a re- markable fact that the number of spots increases and diminishes through a regular ...
... spot through his telescope , he turned away for a moment , and on looking back it was gone . X The appearance of the spots is periodical . — It is a re- markable fact that the number of spots increases and diminishes through a regular ...
Page 59
... spots do not influence the fruitfulness of the sea- son . - Sir W. Herschel first advanced the idea that years of abundant spots would be years also of plen- tiful harvest . This is not now generally received . What two years could be ...
... spots do not influence the fruitfulness of the sea- son . - Sir W. Herschel first advanced the idea that years of abundant spots would be years also of plen- tiful harvest . This is not now generally received . What two years could be ...
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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