Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary HistoryMarsh, Capen, Lyon and Webb, 1841 - 419 من الصفحات |
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الصفحة 15
... nearly as far as it was practicable to go in the wrong road ; and the great and sublime discoveries of modern times are owing , in no small degree , to the fact , that , since the days of Copernicus , astronomers have been pursuing the ...
... nearly as far as it was practicable to go in the wrong road ; and the great and sublime discoveries of modern times are owing , in no small degree , to the fact , that , since the days of Copernicus , astronomers have been pursuing the ...
الصفحة 20
... nearly four 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 ...
... nearly four 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 ...
الصفحة 36
... nearly a ton . So large and ponderous an instrument must require a vast deal of machinery to work it , and to keep it steady ; and , accordingly , the frame - work surrounding it was formed of heavy timbers , and resembled the frame of ...
... nearly a ton . So large and ponderous an instrument must require a vast deal of machinery to work it , and to keep it steady ; and , accordingly , the frame - work surrounding it was formed of heavy timbers , and resembled the frame of ...
الصفحة 37
... nearly five 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 ...
... nearly five 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 ...
الصفحة 55
... we 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.
... we 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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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