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
... determined the situation of a heavenly body , with respect to two great circles at right angles with each other , as in the present case , the distance of a body from the equator and from the equinoctial colure , or that meridian which ...
... determined the situation of a heavenly body , with respect to two great circles at right angles with each other , as in the present case , the distance of a body from the equator and from the equinoctial colure , or that meridian which ...
Page 63
... determined the num- ber of days in the year by means of the stylus , a per- pendicular rod which casts its shadow on a smooth plane bearing a meridian line . The time when the shadow was shortest , would indicate the day of the Summer ...
... determined the num- ber of days in the year by means of the stylus , a per- pendicular rod which casts its shadow on a smooth plane bearing a meridian line . The time when the shadow was shortest , would indicate the day of the Summer ...
Page 72
... thirty - four miles . But it was soon afterwards determined by the astron- omers of France , to ascertain the figure of the earth by actual measurements , specially instituted for that pur- pose . 72 LETTERS ON ASTRONOMY .
... thirty - four miles . But it was soon afterwards determined by the astron- omers of France , to ascertain the figure of the earth by actual measurements , specially instituted for that pur- pose . 72 LETTERS ON ASTRONOMY .
Page 73
... determined to effect simultaneous measurements of arcs of the meridian near the equator , and as near as possible to the north pole , presuming that if degrees of the meridian , in different latitudes , are really of different lengths ...
... determined to effect simultaneous measurements of arcs of the meridian near the equator , and as near as possible to the north pole , presuming that if degrees of the meridian , in different latitudes , are really of different lengths ...
Page 75
... determined in France , and of course less than that of Lapland ; so that the spheroidal figure of the earth appeared ... determination of arcs of the meridian , I am desirous that you should understand its general principles . Let us ...
... determined in France , and of course less than that of Lapland ; so that the spheroidal figure of the earth appeared ... determination of arcs of the meridian , I am desirous that you should understand its general principles . Let us ...
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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