Letters on Astronomy, Addressed to a Lady: In which the Elements of the Science are Familiarly Explained in Connexion [sic] with Its Literary History |
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Page 71
... moon's passing through the earth's shadow , the figure of the shadow is seen to be spherical , which could not be the case unless the earth itself were round . gators , by steering continually in one or west , have in fact come round to ...
... moon's passing through the earth's shadow , the figure of the shadow is seen to be spherical , which could not be the case unless the earth itself were round . gators , by steering continually in one or west , have in fact come round to ...
Page 94
... moon's horizontal parallax is found ; for it must have been previously ascertained , before we could apply this method to finding the distance of the moon from the earth . Suppose that two astronomers take their stations on the same ...
... moon's horizontal parallax is found ; for it must have been previously ascertained , before we could apply this method to finding the distance of the moon from the earth . Suppose that two astronomers take their stations on the same ...
Page 95
... moon , and C D an arc of the sky , then it is evident , that C D would be the parallactic arc . These observations furnish materials for calculating , by the aid of trigonometry , the moon's horizontal parallax , and we have before seen ...
... moon , and C D an arc of the sky , then it is evident , that C D would be the parallactic arc . These observations furnish materials for calculating , by the aid of trigonometry , the moon's horizontal parallax , and we have before seen ...
Page 141
... moon , exerts upon the moon forty times as much force as it would do , were its mass the same with that of the moon ... moon's ; so that the power of attracting and that of being attracted are reciprocal ; and it is therefore correct to ...
... moon , exerts upon the moon forty times as much force as it would do , were its mass the same with that of the moon ... moon's ; so that the power of attracting and that of being attracted are reciprocal ; and it is therefore correct to ...
Page 160
... moon's terminator travel over her disk from new to full moon ; although , in the case of the earth , the motion is more rapid , and depends on a different cause . In the morn- ing , the sun's light first strikes upon the tops of the ...
... moon's terminator travel over her disk from new to full moon ; although , in the case of the earth , the motion is more rapid , and depends on a different cause . In the morn- ing , the sun's light first strikes upon the tops of the ...
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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 inferior planets instrument 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 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 solar system space spectator sphere sun's superior planets supposed surface tance telescope thousand tides tion truth Tycho Tycho Brahe universal gravitation Uranus velocity Venus vernal equinox visible west to east