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 17
... means of investi- gating the facts , whether by instruments or by calcu- lation . It is the province of descriptive astronomy to observe , classify , and record , all the phenomena of the heavenly bodies , whether pertaining to those ...
... means of investi- gating the facts , whether by instruments or by calcu- lation . It is the province of descriptive astronomy to observe , classify , and record , all the phenomena of the heavenly bodies , whether pertaining to those ...
Strona 29
... means of which our knowl- edge of astronomy has been greatly promoted and per- fected . The most ancient astronomers employed no instru- ments of observation , but acquired their knowledge of the heavenly bodies by long - continued and ...
... means of which our knowl- edge of astronomy has been greatly promoted and per- fected . The most ancient astronomers employed no instru- ments of observation , but acquired their knowledge of the heavenly bodies by long - continued and ...
Strona 30
... means of an arm opening at a joint like the blade of a penknife , the end of the arm moving like C E upon the graduated circle K F G. In fact , an instrument con- structed on this principle , resembling a carpenter's rule with a folding ...
... means of an arm opening at a joint like the blade of a penknife , the end of the arm moving like C E upon the graduated circle K F G. In fact , an instrument con- structed on this principle , resembling a carpenter's rule with a folding ...
Strona 32
... means of the telescope , we first form an image of a distant object , as the moon , for example , -and then magnify that image by a microscope . ror . Let us first see how the image is formed . This may be done either by a convex lens ...
... means of the telescope , we first form an image of a distant object , as the moon , for example , -and then magnify that image by a microscope . ror . Let us first see how the image is formed . This may be done either by a convex lens ...
Strona 33
... means , many obscure celestial objects become distinctly visible , which would otherwise be either too minute , or not sufficiently luminous , to be seen by us . But the image may also be formed by means of a concave mirror , which , as ...
... means , many obscure celestial objects become distinctly visible , which would otherwise be either too minute , or not sufficiently luminous , to be seen by us . But the image may also be formed by means of a concave mirror , which , as ...
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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