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 18
... opposite angle A C B is said to be an angle of forty degrees , and to be measured by A B. But this arc is the same part of the smaller circle that EF is of the greater . The arc A B , therefore , con- tains the same number of degrees as ...
... opposite angle A C B is said to be an angle of forty degrees , and to be measured by A B. But this arc is the same part of the smaller circle that EF is of the greater . The arc A B , therefore , con- tains the same number of degrees as ...
Strona 19
... opposite , and consequently their points of section are one hundred and eighty degrees apart . A great circle , which passes through the pole of another great circle , cuts the latter at right angles . The great circle which passes ...
... opposite , and consequently their points of section are one hundred and eighty degrees apart . A great circle , which passes through the pole of another great circle , cuts the latter at right angles . The great circle which passes ...
Strona 27
... opposite to the eye , we see it as an entire circle . If we turn it a little sideways , it appears oval , or as an ellipse ; and , as we continue to turn it more and more round , the ellipse grows narrower and narrower , until , when ...
... opposite to the eye , we see it as an entire circle . If we turn it a little sideways , it appears oval , or as an ellipse ; and , as we continue to turn it more and more round , the ellipse grows narrower and narrower , until , when ...
Strona 85
... opposite hemisphere , a similar part of the sphere adjacent to the depressed pole never rises . Hence , the circle of perpetual occultation is the boun- 8 L. A. dary of that space around the depressed pole , within DIURNAL REVOLUTIONS . 85.
... opposite hemisphere , a similar part of the sphere adjacent to the depressed pole never rises . Hence , the circle of perpetual occultation is the boun- 8 L. A. dary of that space around the depressed pole , within DIURNAL REVOLUTIONS . 85.
Strona 86
... opposite takes place in the hemisphere next the depressed pole . Accordingly , when the sun is in the equator , as the equator and horizon , like all other great circles of the sphere , bisect each other , the days and nights are equal ...
... opposite takes place in the hemisphere next the depressed pole . Accordingly , when the sun is in the equator , as the equator and horizon , like all other great circles of the sphere , bisect each other , the days and nights are equal ...
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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