Fourteen Weeks in Descriptive Astronomy |
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Page 56
... position that the sun's axis is inclined to the ecliptic ( 7 ° 15 ' ) . The spots have a motion of their own . - Besides the motion already named as assigned to the sun's rota- tion , the spots seem to have a motion of their own , and ...
... position that the sun's axis is inclined to the ecliptic ( 7 ° 15 ' ) . The spots have a motion of their own . - Besides the motion already named as assigned to the sun's rota- tion , the spots seem to have a motion of their own , and ...
Page 59
... position . In part explana- tion of this influence of the planets , we may suppose that they , in some manner , modify reflection on the disk of the sun exposed to their action , and thus cause a condensation of gases . The spots do not ...
... position . In part explana- tion of this influence of the planets , we may suppose that they , in some manner , modify reflection on the disk of the sun exposed to their action , and thus cause a condensation of gases . The spots do not ...
Page 75
... position of a planet , as seen from the centre of the sun , is called its heliocentric place ; as seen from the centre of the earth , its geocentric place . When Venus is at inferior conjunction , an observer at the sun would see it in ...
... position of a planet , as seen from the centre of the sun , is called its heliocentric place ; as seen from the centre of the earth , its geocentric place . When Venus is at inferior conjunction , an observer at the sun would see it in ...
Page 79
... positions of the earth and planet , and then drawing lines as we have just done , noticing whether they indicate direct or retrograde motion . The greater the distance of a planet the less it will retrograde THE PLANETS . 79.
... positions of the earth and planet , and then drawing lines as we have just done , noticing whether they indicate direct or retrograde motion . The greater the distance of a planet the less it will retrograde THE PLANETS . 79.
Page 81
... position with regard to the sun . The faster a planet moves , the sooner it can do this . Mercury , travelling at the greater speed and on an inner orbit , accom- plishes it much quicker than Venus . The synodic period always exceeds ...
... position with regard to the sun . The faster a planet moves , the sooner it can do this . Mercury , travelling at the greater speed and on an inner orbit , accom- plishes it much quicker than Venus . The synodic period always exceeds ...
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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