Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary History |
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Page 24
... reach the pole of the earth , that star would appear directly over head . The elevation of the equator above the horizon of any place is equal to the complement of the latitude . Thus , at the latitude of forty degrees north , the ...
... reach the pole of the earth , that star would appear directly over head . The elevation of the equator above the horizon of any place is equal to the complement of the latitude . Thus , at the latitude of forty degrees north , the ...
Page 51
... reach of frost . When enclosed in a building , as in an observatory , the stone pillar is carried up separate from the walls and floors of the building , so as to be entirely free from the agitations to which they are liable . The use ...
... reach of frost . When enclosed in a building , as in an observatory , the stone pillar is carried up separate from the walls and floors of the building , so as to be entirely free from the agitations to which they are liable . The use ...
Page 65
... reach the equinox a little sooner than the twenty - first of March , only eleven minutes , in- deed , but still amounting in twelve hundred years to ten days ; that is , in 1582 , the sun reached the equinox on the eleventh of March ...
... reach the equinox a little sooner than the twenty - first of March , only eleven minutes , in- deed , but still amounting in twelve hundred years to ten days ; that is , in 1582 , the sun reached the equinox on the eleventh of March ...
Page 71
... reach a given place on the earth , by taking directly op- posite courses . Thus , he may reach Canton in China , by a westerly route around Cape Horn , or by an east- erly route around the Cape of Good Hope . All these arguments ...
... reach a given place on the earth , by taking directly op- posite courses . Thus , he may reach Canton in China , by a westerly route around Cape Horn , or by an east- erly route around the Cape of Good Hope . All these arguments ...
Page 76
... reach the point B , by any route ; still , if it could be seen from A and C , it would be all we should want . Thus , in con- ducting a trigonometrical survey of any country , conspic- uous signals are placed on elevated points , and ...
... reach the point B , by any route ; still , if it could be seen from A and C , it would be all we should want . Thus , in con- ducting a trigonometrical survey of any country , conspic- uous signals are placed on elevated points , and ...
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Common terms and phrases
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