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 20
... thousand miles . Still , so vast is the dis- tance of the starry sphere , that both these planes ap- pear to cut the sphere in the same line ; so that we see the same hemisphere of stars that we should see , if the upper half of the ...
... thousand miles . Still , so vast is the dis- tance of the starry sphere , that both these planes ap- pear to cut the sphere in the same line ; so that we see the same hemisphere of stars that we should see , if the upper half of the ...
Page 35
... thousand four hun- dred dollars . Since it is so much easier to make large reflecting than large refracting telescopes , you may ask , why the latter are ever attempted , and why reflectors are not exclusively employed ? I answer , that ...
... thousand four hun- dred dollars . Since it is so much easier to make large reflecting than large refracting telescopes , you may ask , why the latter are ever attempted , and why reflectors are not exclusively employed ? I answer , that ...
Page 37
... thousand dollars , yet it is said that this sum barely covered the actual expenses . It weighs five thousand pounds , and yet is turned with the finger . In facility of management , it has greatly the advantage of Herschel's telescope ...
... thousand dollars , yet it is said that this sum barely covered the actual expenses . It weighs five thousand pounds , and yet is turned with the finger . In facility of management , it has greatly the advantage of Herschel's telescope ...
Page 42
... thousand crowns . It was situated on the island of Huenna , at the entrance of the Baltic , and was called Uraniburg , or the palace of the skies . Before I give you an account of Tycho's observatory , I will recite a few particulars ...
... thousand crowns . It was situated on the island of Huenna , at the entrance of the Baltic , and was called Uraniburg , or the palace of the skies . Before I give you an account of Tycho's observatory , I will recite a few particulars ...
Page 55
... have a mural circle twenty feet in diame- ter , and of course nearly sixty - three feet in circumfer- ence , since there are twenty - one thousand and six hun- dred minutes in the whole circle , we shall find OBSERVATORIES . $ 55.
... have a mural circle twenty feet in diame- ter , and of course nearly sixty - three feet in circumfer- ence , since there are twenty - one thousand and six hun- dred minutes in the whole circle , we shall find OBSERVATORIES . $ 55.
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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