Fourteen Weeks in Descriptive Astronomy |
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Page 57
... 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 astron- Wollaston saw one that seemed to be shat- omer . tered like a fragment of ...
... 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 astron- Wollaston saw one that seemed to be shat- omer . tered like a fragment of ...
Page 59
... disk of the sun exposed to their action , and thus cause a condensation of gases . The 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 ...
... disk of the sun exposed to their action , and thus cause a condensation of gases . The 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 ...
Page 60
... disk of that luminary . Faculæ , willow - leaf , and mottled appearance . - Be- Fig . 11 . sides the variety of spots already de- scribed , there are other curious ap- pearances worthy of note . Bright ridges or streaks appear , which ...
... disk of that luminary . Faculæ , willow - leaf , and mottled appearance . - Be- Fig . 11 . sides the variety of spots already de- scribed , there are other curious ap- pearances worthy of note . Bright ridges or streaks appear , which ...
Page 64
... disk . A cloud once formed becomes a screen to shield the upper regions from the direct heat of the body of the sun . Thus a lighter cloud is produced , which gives the appear- ance of a penumbra around the spots . Spectrum analysis ...
... disk . A cloud once formed becomes a screen to shield the upper regions from the direct heat of the body of the sun . Thus a lighter cloud is produced , which gives the appear- ance of a penumbra around the spots . Spectrum analysis ...
Page 77
... disk . This is called a transit . Fig . 20 . G A RETROGRADE MOTION . Retrograde motion of an inferior planet . Suppose the earth to be at A , and the planet at B. Now , while the earth is passing to F , the planet will pass to D - the ...
... disk . This is called a transit . Fig . 20 . G A RETROGRADE MOTION . Retrograde motion of an inferior planet . Suppose the earth to be at A , and the planet at B. Now , while the earth is passing to F , the planet will pass to D - the ...
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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