Fourteen Weeks in Descriptive Astronomy |
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Page 128
... perihelion points of the orbit itself is slowly moving . The conse- quence of this is a variation in the length of the seasons at different periods of time . In the year 4089 B. C. , about the supposed epoch of the crea- tion , the ...
... perihelion points of the orbit itself is slowly moving . The conse- quence of this is a variation in the length of the seasons at different periods of time . In the year 4089 B. C. , about the supposed epoch of the crea- tion , the ...
Page 129
... perihelion when it is at the vernal equinox ; summer will then be equal to autumn and winter to spring , the former seasons being the longer . In the year 11928 A. D. , the earth will be in perihelion when it is at the summer solstice ...
... perihelion when it is at the vernal equinox ; summer will then be equal to autumn and winter to spring , the former seasons being the longer . In the year 11928 A. D. , the earth will be in perihelion when it is at the summer solstice ...
Page 208
... perihelion , is at r , the comet will appear more distinct than when it is more distant at s , al- though at the latter point it is really brighter . If , how- ever , the earth is at c or bat the time of perihelion , the com- et would ...
... perihelion , is at r , the comet will appear more distinct than when it is more distant at s , al- though at the latter point it is really brighter . If , how- ever , the earth is at c or bat the time of perihelion , the com- et would ...
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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