Fourteen Weeks in Descriptive Astronomy |
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Page 158
... disk of the sun and moon is divided into twelve digits , and the amount of the eclipse is esti- mated by the number of digits which it covers . Thus an eclipse of six digits is one in which half the di- ameter of the disk is concealed ...
... disk of the sun and moon is divided into twelve digits , and the amount of the eclipse is esti- mated by the number of digits which it covers . Thus an eclipse of six digits is one in which half the di- ameter of the disk is concealed ...
Page 181
... disk of Jupiter . In the cut , we see represented the various positions of the moons : the Ist is eclipsed ; the IId is passing across the disk of the planet on which its shadow is also thrown ; the IIId is just behind the planet , and ...
... disk of Jupiter . In the cut , we see represented the various positions of the moons : the Ist is eclipsed ; the IId is passing across the disk of the planet on which its shadow is also thrown ; the IIId is just behind the planet , and ...
Page 310
... disk of the sun . Then we have the pro- portion , As dist . of paper disk : dist . of sun's disk :: diam . of paper d . : diam . sun's d . ( 2. ) The apparent diameter of the sun , as seen from the earth , is about 32 ' : the apparent ...
... disk of the sun . Then we have the pro- portion , As dist . of paper disk : dist . of sun's disk :: diam . of paper d . : diam . sun's d . ( 2. ) The apparent diameter of the sun , as seen from the earth , is about 32 ' : the apparent ...
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Common terms and phrases
ancients angle aphelion appear astronomers atmosphere axis bright brilliant called Capricornus Cassiopeia Celestial Sphere centre circle color comet conjunction constellation Cor Caroli dark density diameter disk earth east ecliptic equal equator equinoctial figure fixed stars full moon globe heat heavenly bodies heavens Hercules Herschel horizon inclined inferior inferior conjunction inferior planet Jupiter latitude length light longitude luminous lunar magnitude Mars mean distance measured Mercury meridian meteors miles moon moon's motion move naked eye nearly nebula Neptune night node north pole obliquity observer orbit parallax pass path penumbra perihelion Perseus planet polar position rays revolve Right Ascension ring rotation satellites Saturn seasons seen shadow shine side sidereal sidereal day solar system space spots summer sun's superior planet supposed surface synodic revolution tance Taurus telescope theory tion Uranus Ursa Major varies velocity Venus vernal equinox visible zenith zodiac