A Handbook of Descriptive and Practical Astronomy: The sun, planets, and cometsClarendon Press, 1889 - Astronomical instruments |
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Page xx
... Usually in the direction of the radius vector . - Secondary Tails . - Vibration sometimes noticed in tails . - Olbers's hypothesis . - Transits of Comets across the Sun's disc . Variation in the appearance of Comets exemplified in the ...
... Usually in the direction of the radius vector . - Secondary Tails . - Vibration sometimes noticed in tails . - Olbers's hypothesis . - Transits of Comets across the Sun's disc . Variation in the appearance of Comets exemplified in the ...
Page 8
... usually surrounded by a fringe of a lighter shade , called a penum- bra , the two not passing into each other by gradations of tint , but abruptly . In the few cases in which a gradual shading has It will appear from what is stated ...
... usually surrounded by a fringe of a lighter shade , called a penum- bra , the two not passing into each other by gradations of tint , but abruptly . In the few cases in which a gradual shading has It will appear from what is stated ...
Page 9
... usually darker than nearer the centre . They are frequently very irregular in their outlines ( though often they conform somewhat closely to the general contour of the umbræ which they circumscribe ) , but the umbræ , especially in the ...
... usually darker than nearer the centre . They are frequently very irregular in their outlines ( though often they conform somewhat closely to the general contour of the umbræ which they circumscribe ) , but the umbræ , especially in the ...
Page 17
... usually radiating in straight lines from the umbra ; Secchi with greater optical power , defined these radiations to be alternate streaks of the bright light of the photosphere and dark veins converging to the umbra® . Some Sun - spots ...
... usually radiating in straight lines from the umbra ; Secchi with greater optical power , defined these radiations to be alternate streaks of the bright light of the photosphere and dark veins converging to the umbra® . Some Sun - spots ...
Page 24
... usually traceable to some of those minute pores or dots which stipple the Sun's surface , and which begin to increase , to assume an umbral blackness , and acquire a visible and , at first , very irregular and changeable shape . It is ...
... usually traceable to some of those minute pores or dots which stipple the Sun's surface , and which begin to increase , to assume an umbral blackness , and acquire a visible and , at first , very irregular and changeable shape . It is ...
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Common terms and phrases
apparition April astronomers atmosphere axis Berberich bright brilliant C. H. F. Peters calculated centre Chinese obs colour comet appeared comet was seen corona cubits cubits long dark diameter disappeared disc discovered discovery Earth elliptic orbit Encke Encke's comet equator Halley's comet Herschel Hind Inferior Conjunction July July 29 June Jupiter Lassell latitude Leonis light limb longitude luminous lunar Ma-tuoan-lin Mailla March Mars mean distance Mercury meteors miles minor planets Month Moon Moon's motion naked eye nearly Neptune node noticed nucleus observations Observatory Palisa Palisa Vienna parallax passed perihelion period assigned phenomenon Pingré planet radiant rays remarkable ring rotation satellites Saturn Sept shadow shower sidereal division solar solar eclipse spots star Sun-spot Sun's surface tail telescope total eclipse transit Uranus Ursa Ursa Major Venus visible weeks Williams Winnecke Zodiacal Light ΙΟ
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