Fourteen Weeks in Descriptive Astronomy |
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Page 47
... HEAT OF THE SUN . - The amount of heat we receive annually is sufficient to melt a layer of ice thirty - eight yards in thickness , extending over the whole earth . Yet the sunbeam is only 300,000 part as intense as it is at the surface ...
... HEAT OF THE SUN . - The amount of heat we receive annually is sufficient to melt a layer of ice thirty - eight yards in thickness , extending over the whole earth . Yet the sunbeam is only 300,000 part as intense as it is at the surface ...
Page 60
... heat radiated by a spot , which seems totally black as compared with the sun : we remember that when we look through even a Drummond light at the sun , it appears as a black spot on the disk of that luminary . Faculæ , willow - leaf ...
... heat radiated by a spot , which seems totally black as compared with the sun : we remember that when we look through even a Drummond light at the sun , it appears as a black spot on the disk of that luminary . Faculæ , willow - leaf ...
Page 62
... heat of the sun . The third , or outer one , is transparent , very like our atmosphere . According to this theory , the spots are to be explained in the following manner . They are simply openings in these atmospheres made by powerful ...
... heat of the sun . The third , or outer one , is transparent , very like our atmosphere . According to this theory , the spots are to be explained in the following manner . They are simply openings in these atmospheres made by powerful ...
Page 64
... heat . Changes of temperature take place , which give rise to tornadoes and violent tempests . Descending currents pro- duce openings filled with clouds , which appear as black spots on the sun's disk . A cloud once formed becomes a ...
... heat . Changes of temperature take place , which give rise to tornadoes and violent tempests . Descending currents pro- duce openings filled with clouds , which appear as black spots on the sun's disk . A cloud once formed becomes a ...
Page 65
... heat , feeds this great central fire . Were Mercury to strike the sun in this way , it would generate sufficient heat to compensate the loss by radiation for seven years . Many suppose that the heat of the sun is gradually diminishing ...
... heat , feeds this great central fire . Were Mercury to strike the sun in this way , it would generate sufficient heat to compensate the loss by radiation for seven years . Many suppose that the heat of the sun is gradually diminishing ...
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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