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
... surface of the sphere is measured by an arc of an- other great circle , of which the angular point is the pole , being the arc of that great circle intercepted be- tween those two circles . In order to fix the position of any place ...
... surface of the sphere is measured by an arc of an- other great circle , of which the angular point is the pole , being the arc of that great circle intercepted be- tween those two circles . In order to fix the position of any place ...
Strona 20
... surface of the earth has its own horizon ; and the traveller has a new horizon at every step , always extending ninety degrees from him , in all directions . Vertical circles are those which pass through the poles of the horizon , ( the ...
... surface of the earth has its own horizon ; and the traveller has a new horizon at every step , always extending ninety degrees from him , in all directions . Vertical circles are those which pass through the poles of the horizon , ( the ...
Strona 21
... surface of the earth constitutes the terres- trial , and its intersection with the concave sphere of the heavens , the celestial , equator . The latter , by way of distinction , is sometimes denominated the equinoctial . The secondaries ...
... surface of the earth constitutes the terres- trial , and its intersection with the concave sphere of the heavens , the celestial , equator . The latter , by way of distinction , is sometimes denominated the equinoctial . The secondaries ...
Strona 29
... surface of the sphere , as two stars , for example , and imagine straight lines to be drawn to them from the eye , the angle included be- tween these lines will be measured by the arc of the sky contained between the two points . Thus ...
... surface of the sphere , as two stars , for example , and imagine straight lines to be drawn to them from the eye , the angle included be- tween these lines will be measured by the arc of the sky contained between the two points . Thus ...
Strona 59
... surface of the earth is separated from its contiguous portions that constitute a great circle of the sphere , by applying to it a two - foot scale ; or as a few yards of cloth are measured off from a piece of unknown or in- definite ...
... surface of the earth is separated from its contiguous portions that constitute a great circle of the sphere , by applying to it a two - foot scale ; or as a few yards of cloth are measured off from a piece of unknown or in- definite ...
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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