Fourteen Weeks in Descriptive Astronomy |
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Page 9
... heat of the sun could be maintained by an annual con- traction of 250 feet in its diameter - a decrease so insignificant as to be imperceptible with the best instruments ; or by the annual impact of meteors equal in amount to the mass ...
... heat of the sun could be maintained by an annual con- traction of 250 feet in its diameter - a decrease so insignificant as to be imperceptible with the best instruments ; or by the annual impact of meteors equal in amount to the mass ...
Page 10
... heat to the earth has long been a mooted question . The best authorities , at present , estimate the average heat of the moon - beam at about 280,00 that which we receive from the sun , or sufficient to raise the temperature of a ...
... heat to the earth has long been a mooted question . The best authorities , at present , estimate the average heat of the moon - beam at about 280,00 that which we receive from the sun , or sufficient to raise the temperature of a ...
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 , and ...
... 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 , and ...
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 ...
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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