Fourteen Weeks in Descriptive Astronomy |
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Page 23
... Dark Ages , and prompted to accurate observa- tion and diligent study of the heavens . THE COPERNICAN SYSTEM . - About the middle of the sixteenth century , Copernicus , breaking away from the theory of Ptolemy , which was still taught ...
... Dark Ages , and prompted to accurate observa- tion and diligent study of the heavens . THE COPERNICAN SYSTEM . - About the middle of the sixteenth century , Copernicus , breaking away from the theory of Ptolemy , which was still taught ...
Page 53
... dark portions called the umbra , and around that a grayish portion styled the pe- numbra ( pene , almost , and um- bra , black ) .— Sometimes , how- ever , umbræ ap- pear without a penumbra , and vice versa . The umbra itself has ...
... dark portions called the umbra , and around that a grayish portion styled the pe- numbra ( pene , almost , and um- bra , black ) .— Sometimes , how- ever , umbræ ap- pear without a penumbra , and vice versa . The umbra itself has ...
Page 60
... . Under a large telescope the surface seems to be entirely made up of luminous masses , imperfectly separated by dark dots called pores . These masses are said by Mr. Nasmyth to have a " willow -. 60 THE SOLAR SYSTEM .
... . Under a large telescope the surface seems to be entirely made up of luminous masses , imperfectly separated by dark dots called pores . These masses are said by Mr. Nasmyth to have a " willow -. 60 THE SOLAR SYSTEM .
Page 62
... dark globe , surrounded by three atmospheres . The first , nearest the black body of the sun , is a dense , cloudy covering , pos- sessing high reflecting power . The second is called the photosphere . It consists of an incandescent gas ...
... dark globe , surrounded by three atmospheres . The first , nearest the black body of the sun , is a dense , cloudy covering , pos- sessing high reflecting power . The second is called the photosphere . It consists of an incandescent gas ...
Page 63
... DARK nucleus EARTH EARTH WILSON'S THEORY . EARTH see , also , how , as the sun revolving on its axis brings a spot nearer and nearer to the centre , thus giving us a more direct view of the opening , we can see more and more of the dark ...
... DARK nucleus EARTH EARTH WILSON'S THEORY . EARTH see , also , how , as the sun revolving on its axis brings a spot nearer and nearer to the centre , thus giving us a more direct view of the opening , we can see more and more of the dark ...
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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