Elementary Lessons in Astronomy |
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Page ix
... period Comets . Head , Tail , Coma , Nucleus , Jets , Envelopes . Their probable Number and Physical Constitution XXIV . - Luminous Meteors . Shooting Stars . November Showers . Radiant Points . XXV . - Luminous Meteors ( concluded ) ...
... period Comets . Head , Tail , Coma , Nucleus , Jets , Envelopes . Their probable Number and Physical Constitution XXIV . - Luminous Meteors . Shooting Stars . November Showers . Radiant Points . XXV . - Luminous Meteors ( concluded ) ...
Page x
... Period , and Periodic Time XXXII . - Apparent Motions of the Planets ( concluded ) . In- clinations and Nodes of the Orbits . Apparent Paths among the Stars . Effects on Physical Observations . Mars . Saturn's Rings PAGE 176 182 CHAPTER ...
... Period , and Periodic Time XXXII . - Apparent Motions of the Planets ( concluded ) . In- clinations and Nodes of the Orbits . Apparent Paths among the Stars . Effects on Physical Observations . Mars . Saturn's Rings PAGE 176 182 CHAPTER ...
Page 20
... period of the variability is the time that elapses between two successive greatest bright- nesses . 53. We give a table of a few variable stars , in order that the foregoing may be clearly understood : Change of Magnitude from • · I ...
... period of the variability is the time that elapses between two successive greatest bright- nesses . 53. We give a table of a few variable stars , in order that the foregoing may be clearly understood : Change of Magnitude from • · I ...
Page 21
... Period of Change 46 years . 73 years . • 435 days . } • 331 29 10 . ΙΟ • 99 21 % , " 9 n Argús R Cephei R Cassiopea o Ceti s Cancri B Persei • 54. The fourth star on our list is a very interesting one , for at its period of greatest ...
... Period of Change 46 years . 73 years . • 435 days . } • 331 29 10 . ΙΟ • 99 21 % , " 9 n Argús R Cephei R Cassiopea o Ceti s Cancri B Persei • 54. The fourth star on our list is a very interesting one , for at its period of greatest ...
Page 22
... period variable star which is very bright at its maximum and fades out of view at its mini- mum , we may expect a reappearance of the star in the year 1885 . 56. We now come to the new star which broke upon our sight last year , in the ...
... period variable star which is very bright at its maximum and fades out of view at its mini- mum , we may expect a reappearance of the star in the year 1885 . 56. We now come to the new star which broke upon our sight last year , in the ...
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Common terms and phrases
angular aphelion apparent motion appear astronomers atmosphere attraction base line Boötes called Cassiopea celestial equator celestial pole celestial sphere centre Cepheus clock colour comet constellations density determined diameter direction Earth Earth's axis Earth's rotation Earth's surface ecliptic equal equatorial exactly eye-piece fact fall feet globe Greenwich heat heavenly body heavens Hence horizon inclined instance Jupiter latitude length lens LESSON light longitude Mars mass mean sun measured meridian meteors midnight miles Moon Moon's nearly nebulæ Neptune night node noon object-glass observed occupied parallax pass path perihelion period planet point of Aries polar portion position prism rays refraction represent revolution revolve round right ascension ring rise round the Sun satellites Saturn seen shadow side sidereal solar day solstice spectrum stars Sun's suppose telescope tion triangle true sun Uranus Ursa Major vapour varies velocity Venus vernal equinox visible zenith distance
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