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 71
... effects of the earth's centrifugal force , oc- casioned by its rapid revolution on its own axis . When water is whirled in a pail , we see it recede from the centre and accumulate upon the sides of the vessel ; FIGURE OF THE EARTH . 71.
... effects of the earth's centrifugal force , oc- casioned by its rapid revolution on its own axis . When water is whirled in a pail , we see it recede from the centre and accumulate upon the sides of the vessel ; FIGURE OF THE EARTH . 71.
Page 73
... 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 , they will ...
... 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 , they will ...
Page 80
... effects ought to be visible in the motions of the moon , which it would influence by its gravity ; and there , also , its effects are traced . At length , we apply our meas- ures to the surface of the earth itself , and find the same ...
... effects ought to be visible in the motions of the moon , which it would influence by its gravity ; and there , also , its effects are traced . At length , we apply our meas- ures to the surface of the earth itself , and find the same ...
Page 93
... effect of paral- lax upon the place of a celestial body is to depress it . Thus , in consequence of parallax , E is depressed by the arc H h ; F , by the arc P p ; G , by the arc R r ; while O sustains no change . Hence , in all ...
... effect of paral- lax upon the place of a celestial body is to depress it . Thus , in consequence of parallax , E is depressed by the arc H h ; F , by the arc P p ; G , by the arc R r ; while O sustains no change . Hence , in all ...
Page 95
... effect of the atmosphere , called refraction . Refraction elevates the apparent place of a body , while parallax depresses it . It affects alike the most distant as well as nearer bodies . In order to understand the nature of refraction ...
... effect of the atmosphere , called refraction . Refraction elevates the apparent place of a body , while parallax depresses it . It affects alike the most distant as well as nearer bodies . In order to understand the nature of refraction ...
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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