Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary HistoryMarsh, Capen, Lyon and Webb, 1841 - 419 |
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Strona 12
... atmosphere than others enjoy . We should at first imagine , that a study which calls upon its votaries for the severest efforts of the human intellect , which demands the undivided toil of years , and which robs the night of its ...
... atmosphere than others enjoy . We should at first imagine , that a study which calls upon its votaries for the severest efforts of the human intellect , which demands the undivided toil of years , and which robs the night of its ...
Strona 39
... atmosphere , the medium is usually very unsteady . If the sun shines out warm after a cloudy season , the ground first becomes heated , and the air that is nearest to it is expanded , and rises , while the colder air de- scends , and ...
... atmosphere , the medium is usually very unsteady . If the sun shines out warm after a cloudy season , the ground first becomes heated , and the air that is nearest to it is expanded , and rises , while the colder air de- scends , and ...
Strona 40
... atmosphere , also , is more perfectly dissolved in hot than in cold air , and the more water air contains , provided it is in a state of perfect solution , the clearer it is . A certain preparation of the observer himself is also ...
... atmosphere , also , is more perfectly dissolved in hot than in cold air , and the more water air contains , provided it is in a state of perfect solution , the clearer it is . A certain preparation of the observer himself is also ...
Strona 48
... be attained in the construction of an observatory are , a commanding and unobstructed view of the heavens ; freedom from causes that affect the transparency and uniform state of the atmosphere , such 48 LETTERS ON ASTRONOMY .
... be attained in the construction of an observatory are , a commanding and unobstructed view of the heavens ; freedom from causes that affect the transparency and uniform state of the atmosphere , such 48 LETTERS ON ASTRONOMY .
Strona 49
... atmosphere , such as fires , smoke , or marshy grounds ; mechanical facilities for the management of instruments , and , es- pecially , every precaution that is necessary to secure perfect steadiness . This last consideration is one of ...
... atmosphere , such as fires , smoke , or marshy grounds ; mechanical facilities for the management of instruments , and , es- pecially , every precaution that is necessary to secure perfect steadiness . This last consideration is one of ...
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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