Fourteen Weeks in Descriptive Astronomy |
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Page 53
From the accompanying representation it will be seen that the spots generally
consist of one or more dark portions called the umbra, and around that a grayish
portion styled the penumbra (pcne, almost, and umbra, black). — Sometimes ...
From the accompanying representation it will be seen that the spots generally
consist of one or more dark portions called the umbra, and around that a grayish
portion styled the penumbra (pcne, almost, and umbra, black). — Sometimes ...
Page 59
... the sun, which have been taken in large numbers of late at Kew Observatory.
Comparative brightness of spots and sun. — If we represent the ordinary
brightness of the sun by Fig. 11. 1,000, then that of the penumbra would be THE
SUN. 59.
... the sun, which have been taken in large numbers of late at Kew Observatory.
Comparative brightness of spots and sun. — If we represent the ordinary
brightness of the sun by Fig. 11. 1,000, then that of the penumbra would be THE
SUN. 59.
Page 60
1,000, then that of the penumbra would be 469, and that of the nucleus 7. There
may be much light and heat radiated by a spot, which seems totally black as
compared with the sun : we remember that when we look through even a
Drumrnond ...
1,000, then that of the penumbra would be 469, and that of the nucleus 7. There
may be much light and heat radiated by a spot, which seems totally black as
compared with the sun : we remember that when we look through even a
Drumrnond ...
Page 61
Indeed, it is said that the spots themselves always have their origin in a "pore,"
which appears to slowly increase and assume the blackness of an umbra, after
which the penumbra begins to appear. Physical Constitution of the Sun. — Of the
...
Indeed, it is said that the spots themselves always have their origin in a "pore,"
which appears to slowly increase and assume the blackness of an umbra, after
which the penumbra begins to appear. Physical Constitution of the Sun. — Of the
...
Page 62
At the bottom of these chasms we see the dark sun as a nucleus at the centre,
and around this the cloudy atmosphere— the penumbra. This explains a black
spot with its penumbra. Sometimes the opening in the photosphere may be
smaller ...
At the bottom of these chasms we see the dark sun as a nucleus at the centre,
and around this the cloudy atmosphere— the penumbra. This explains a black
spot with its penumbra. Sometimes the opening in the photosphere may be
smaller ...
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ancients angle aphelion appear Aries astronomers atmosphere axis bright brilliant Canis Minor Capricornus Cassiopeia cause celestial 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 globe heat heavenly bodies heavens Herschel horizon inclined inferior 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 node north pole orbit Orion parallax pass path penumbra perihelion Perseus Pisces planet polar Polaris rays revolve ring rising Saturn seasons seen shine side sidereal sidereal day solar day solar system solstice space sphere spots summer sun's surface synodic revolution tance Taurus telescope theory tion umbra Uranus Ursa Major Ursa Minor varies velocity Venus vernal equinox visible winter zenith Zodiac
Bibliographic information
| Title | Fourteen Weeks in Descriptive Astronomy Fourteen weeks courses in natural science |
| Author | Joel Dorman Steele |
| Publisher | A.S. Barnes & Company, 1873 |
| Original from | the University of California |
| Digitized | 14 Oct 2010 |
| Length | 336 pages |
| Export Citation | BiBTeX EndNote RefMan |