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 11
... course , that we can at first hardly see any good reason why it should be dignified with the title of the first great law of motion ; and yet it contains a truth which it required profound sagacity to discover and expound . It is ...
... course , that we can at first hardly see any good reason why it should be dignified with the title of the first great law of motion ; and yet it contains a truth which it required profound sagacity to discover and expound . It is ...
Strona 14
... course of these Letters , I propose to trace an outline of the history of astronomy , from the earliest ages to the present time , you may think this the most suitable place for introducing it ; but the successive discoveries in the ...
... course of these Letters , I propose to trace an outline of the history of astronomy , from the earliest ages to the present time , you may think this the most suitable place for introducing it ; but the successive discoveries in the ...
Strona 26
... course perpendicularly to the equator , will be secondaries to the equator , constituting meridians , or hour circles . A great circle cut through the centre of the earth , from one tropic to the other , would represent the plane of the ...
... course perpendicularly to the equator , will be secondaries to the equator , constituting meridians , or hour circles . A great circle cut through the centre of the earth , from one tropic to the other , would represent the plane of the ...
Strona 51
... course with the revolution of the earth on its axis ; that is , it is regulated to sidereal time . It measures the progress of a star , indicating an hour for every fifteen degrees , and twenty - four hours for the whole period of the ...
... course with the revolution of the earth on its axis ; that is , it is regulated to sidereal time . It measures the progress of a star , indicating an hour for every fifteen degrees , and twenty - four hours for the whole period of the ...
Strona 53
... course to measure any distance from it on the meridian , while , as there is nothing to mark the exact situation of the equinoctial , it is not so easy to take direct meas- urements from it . When we have thus determined the situation ...
... course to measure any distance from it on the meridian , while , as there is nothing to mark the exact situation of the equinoctial , it is not so easy to take direct meas- urements from it . When we have thus determined the situation ...
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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