On the Connexion of the Physical Sciences |
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Page 3
Physical astronomy is the science which compares and identifies the laws of motion observed on earth with the motions that take place in the heavens : and which traces , by an uninterrupted chain of deduction from the great principle ...
Physical astronomy is the science which compares and identifies the laws of motion observed on earth with the motions that take place in the heavens : and which traces , by an uninterrupted chain of deduction from the great principle ...
Page 5
Kepler found , by direct observation , that the planets describe ellipses ( N. 24 ) , or oval paths , round the sun . Later observations show that comets also move in conic sections . It consequently follows that the sun attracts all ...
Kepler found , by direct observation , that the planets describe ellipses ( N. 24 ) , or oval paths , round the sun . Later observations show that comets also move in conic sections . It consequently follows that the sun attracts all ...
Page 15
It has been observed , that the radius vector of a planet , moving in a perfectly elliptical orbit , passes over equal spaces or areas in equal times ; a circumstance which is independent of the law of the force , and would be the same ...
It has been observed , that the radius vector of a planet , moving in a perfectly elliptical orbit , passes over equal spaces or areas in equal times ; a circumstance which is independent of the law of the force , and would be the same ...
Page 25
of gravitation are so perfectly confirmed by observation , that analysis has become one of the most certain means of ... All observations , from those of the Chinese and Arabs down to the present day , prove that for ages the mean ...
of gravitation are so perfectly confirmed by observation , that analysis has become one of the most certain means of ... All observations , from those of the Chinese and Arabs down to the present day , prove that for ages the mean ...
Page 30
The instant of the beginning or end of an eclipse of a satellite marks the same instant of absolute time to all the inhabitants of the earth ; therefore , the time of these eclipses observed by a traveller , when compared with the time ...
The instant of the beginning or end of an eclipse of a satellite marks the same instant of absolute time to all the inhabitants of the earth ; therefore , the time of these eclipses observed by a traveller , when compared with the time ...
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Common terms and phrases
absorbed according action angle appears atmosphere attraction axis becomes bismuth blue bodies cause centre chemical colour comet consequently continually crystal dark depends determined diameter diminishes direction distance disturbing earth ecliptic effect electricity equal equator ether exist experiments extends extreme fall force give glass gravitation greater green heat increase instance intensity John known latitude length less light lines liquid magnetic mass matter mean measured medium metallic miles moon motion move nature nearly NOTE object observed opposite orbit particles passing periodic phenomena plane plate polarized pole position produced proportion proved quantity rays reflected refraction refrangible revolving rings rotation round satellites seen separated shows side similar solar sound space spectrum square stars substances surface temperature theory tion transmitted undulations varies vibrations visible waves whole wire