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 19
... appear to us , wherever we are placed , to be fixed in the same concave surface , or ce- lestial vault . The great circles of the globe , extended every way to meet the concave sphere of the heavens DOCTRINE OF THE SPHERE . 19.
... appear to us , wherever we are placed , to be fixed in the same concave surface , or ce- lestial vault . The great circles of the globe , extended every way to meet the concave sphere of the heavens DOCTRINE OF THE SPHERE . 19.
Strona 24
... appear in the horizon . Or , if we should travel northwards , the north star would rise continually higher and higher , until , if we could reach the pole of the earth , that star would appear directly over head . The elevation of the ...
... appear in the horizon . Or , if we should travel northwards , the north star would rise continually higher and higher , until , if we could reach the pole of the earth , that star would appear directly over head . The elevation of the ...
Strona 27
... appears oval , or as an ellipse ; and , as we continue to turn it more and more round , the ellipse grows narrower and ... appear to be inscribed on the wall , and we shall see the ring as a circle , when perpendicular DOCTRINE OF THE ...
... appears oval , or as an ellipse ; and , as we continue to turn it more and more round , the ellipse grows narrower and ... appear to be inscribed on the wall , and we shall see the ring as a circle , when perpendicular DOCTRINE OF THE ...
Strona 29
... appear to be in the centre of a vast sphere , on the concave sur- face of which all celestial objects are inscribed . If we take any two points on the surface of the sphere , as two stars , for example , and imagine straight lines to be ...
... appear to be in the centre of a vast sphere , on the concave sur- face of which all celestial objects are inscribed . If we take any two points on the surface of the sphere , as two stars , for example , and imagine straight lines to be ...
Strona 81
... appear to move , every star having its own pecu- liar circle . After you have first rendered familiar the real motion of the earth from west to east , you may then , without danger of misapprehension , adopt the common language , that ...
... appear to move , every star having its own pecu- liar circle . After you have first rendered familiar the real motion of the earth from west to east , you may then , without danger of misapprehension , adopt the common language , that ...
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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