Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary History |
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Page 12
... bright and changeless . The renewed pleasure which he feels , at every new survey of the constellations , grows into an af- fection for objects which have so often ministered to his happiness . His imagination aids him in giving them a ...
... bright and changeless . The renewed pleasure which he feels , at every new survey of the constellations , grows into an af- fection for objects which have so often ministered to his happiness . His imagination aids him in giving them a ...
Page 13
... bright stars still attend him . When , moreover , the student of the heavens can command the aid of telescopes , of higher and higher powers , new acquaintances are made every evening . The sight of each new member of the starry train ...
... bright stars still attend him . When , moreover , the student of the heavens can command the aid of telescopes , of higher and higher powers , new acquaintances are made every evening . The sight of each new member of the starry train ...
Page 32
... bright circle in the focus . This is in fact a small image of the sun . In the same manner , the image of any distant object , as a star , may be formed , as is represented in the following diagram . Let A B C D , Fig . 4 , represent ...
... bright circle in the focus . This is in fact a small image of the sun . In the same manner , the image of any distant object , as a star , may be formed , as is represented in the following diagram . Let A B C D , Fig . 4 , represent ...
Page 34
... bright images . Such instruments are called achromatic tele- scopes , a name implying the absence of prismatic or rainbow colors in the image . It is , however , far more difficult to construct large achromatic than large reflect- ing ...
... bright images . Such instruments are called achromatic tele- scopes , a name implying the absence of prismatic or rainbow colors in the image . It is , however , far more difficult to construct large achromatic than large reflect- ing ...
Page 36
... building . When one of the largest of the fixed stars , as Sirius , is entering the field of this telescope , its approach is announced by a bright dawn , like that which 36 LETTERS ON ASTRONOMY . LETTER IV Telescope continued,
... building . When one of the largest of the fixed stars , as Sirius , is entering the field of this telescope , its approach is announced by a bright dawn , like that which 36 LETTERS ON ASTRONOMY . LETTER IV Telescope continued,
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Common terms and phrases
angle appear ascertain astronomers atmosphere attraction axis called celestial centre circle comet conjunction constellation degrees diameter direction discovery disk distance diurnal motion doctrine double stars earth ecliptic equal equator equinox exhibited fact fixed stars force Galileo globe gravity greater greatest half Halley's comet heavenly bodies heavens Hence Herschel horizon hundred inferior conjunction instrument John Herschel Jupiter Kepler latitude laws length less light longitude lunar lunar eclipse magnitude measure Mercury meridian meteors millions of miles minutes moon moon's motion move Nature nearer nearly node objects observations opposite orbit parallax passing perihelion period phenomena planetary planets pole respect revolve right ascension ring round satellites Saturn seen shadow side space spectator sphere sun's superior planets supposed surface telescope thousand tides tion truth Tycho Tycho Brahe universal gravitation Uranus velocity Venus vernal equinox visible west to east