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 53
... shadow projected upon it by the perpendicular casing of the window . Let an assistant stand , with a rule laid on the line of shadow , and with a knife ready to make the mark , the instant when the observer at the transit instrument ...
... shadow projected upon it by the perpendicular casing of the window . Let an assistant stand , with a rule laid on the line of shadow , and with a knife ready to make the mark , the instant when the observer at the transit instrument ...
Page 54
... shadow shall fall upon the circumference of the circle at some hour before noon , as about ten o'clock . Make a small dot at the point where the end of the shadow falls upon the circle , and do the same where it falls upon it again in ...
... shadow shall fall upon the circumference of the circle at some hour before noon , as about ten o'clock . Make a small dot at the point where the end of the shadow falls upon the circle , and do the same where it falls upon it again in ...
Page 63
... shadow on a smooth plane bearing a meridian line . The time when the shadow was shortest , would indicate the day of the Summer solstice ; and the number of days which elaps- ed , until the shadow returned to the same length again ...
... shadow on a smooth plane bearing a meridian line . The time when the shadow was shortest , would indicate the day of the Summer solstice ; and the number of days which elaps- ed , until the shadow returned to the same length again ...
Page 71
... shadow , the figure of the shadow is seen to be spherical , which could not be the case unless the earth itself were round . Thirdly , navi- gators , by steering continually in one direction , as east or west , have in fact come round ...
... shadow , the figure of the shadow is seen to be spherical , which could not be the case unless the earth itself were round . Thirdly , navi- gators , by steering continually in one direction , as east or west , have in fact come round ...
Page 80
... shadow is altered , by its spheroidal figure , -a circumstance which affects the time and duration of a lunar eclipse . All these different and independent phenomena afford a pleasing example of the harmony of truth . The known effects ...
... shadow is altered , by its spheroidal figure , -a circumstance which affects the time and duration of a lunar eclipse . All these different and independent phenomena afford a pleasing example of the harmony of truth . The known effects ...
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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