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
... light , and there was light ; " and the doctrine of universal gravitation , which is the key that unlocks the mysteries of the universe , is simply this , that every portion of matter in the universe tends towards every other . The ...
... light , and there was light ; " and the doctrine of universal gravitation , which is the key that unlocks the mysteries of the universe , is simply this , that every portion of matter in the universe tends towards every other . The ...
Strona 31
... light that emanates from the object , than would enter the naked pupil . A complete knowledge of the telescope cannot be acquired , without an acquaintance with the science of optics ; but one unacquainted with that sci- * From two ...
... light that emanates from the object , than would enter the naked pupil . A complete knowledge of the telescope cannot be acquired , without an acquaintance with the science of optics ; but one unacquainted with that sci- * From two ...
Strona 32
... light from the moon , and collects them into the focus at a , forming an image of the moon . This image is viewed by a magnifier attached to the end BC . The lens , L , is called the object - glass , and the microscope in BC , the ...
... light from the moon , and collects them into the focus at a , forming an image of the moon . This image is viewed by a magnifier attached to the end BC . The lens , L , is called the object - glass , and the microscope in BC , the ...
Strona 33
... light only , from a dis- tant object , as a star , can enter the eye directly ; but a lens one foot in diameter will collect a beam of light of the same dimensions , and convey it to the eye . By these means , many obscure celestial ...
... light only , from a dis- tant object , as a star , can enter the eye directly ; but a lens one foot in diameter will collect a beam of light of the same dimensions , and convey it to the eye . By these means , many obscure celestial ...
Strona 34
... light which is collected by the object - glass , or by the mirror , and conveyed to the eye ; and therefore , small object - glasses cannot have a very high illuminating power . Now , the experiments of Newton on colors led him to ...
... light which is collected by the object - glass , or by the mirror , and conveyed to the eye ; and therefore , small object - glasses cannot have a very high illuminating power . Now , the experiments of Newton on colors led him to ...
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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