Professor Montgomery's Discoveries in Celestial Mechanics

Εξώφυλλο
Pernau-Walsh Printing Company, 1919 - 34 σελίδες
 

Επιλεγμένες σελίδες

Άλλες εκδόσεις - Προβολή όλων

Συχνά εμφανιζόμενοι όροι και φράσεις

Δημοφιλή αποσπάσματα

Σελίδα 3 - And sees them, when the rain is done, On the bridge of colors seven Climbing up once more to heaven, Opposite the setting sun. Thus the Seer, With vision clear, Sees forms appear and disappear, In the perpetual round of strange, Mysterious change From birth to death, from death to birth, From earth to heaven, from heaven to earth ; Till glimpses more sublime Of things, unseen before, Unto his wondering eves reveal The Universe, as an immeasurable wheel Turning forevermore In the rapid and rushing...
Σελίδα 33 - ... effects depend are so related that they are exactly equal. Even if they were equal at one time, they would become unequal with a changed distance of the moon from the earth. That is, the present is not a fixed state of equilibrium, and the consideration of the tides does not remove the difficulties. It seems probable from this line of thought that some influence so far not considered has caused the moon always to present the same face towards the earth. 1 In another paragraph Professor Moulton...
Σελίδα 34 - While Laplace assigns no cause for the heat which he ascribes to his nebula, Lord Kelvin goes further back and supposes a cold nebula consisting of separate atoms or of meteoric stones, initially possessed of a resultant moment of momentum equal or superior to that of the solar system. Collision at the center will reduce them to a vapor which then expanding far beyond Neptune's orbit will give a nebula such as Laplace postulates.!
Σελίδα 34 - Laplace assigns no cause for the heat which he ascribes to his nebula, Lord Kelvin goes further back and supposes a cold nebula consisting of separate atoms or of meteoric stones, initially possessed of a resultant moment of momentum equal or superior to that of the solar system. Collision at the center will reduce them to a vapor which then expanding far beyond Neptune's orbit will give a nebula such as Laplace postulates.! Thus Kelvin goes back to the same initial condition as Kant, excepting that...
Σελίδα 28 - It seems impossible to predicate how far the moon can ever conform to the circumstances of an actual rigid body, but it may be conceivable that at some future time the tidal control shall have practically ceased. There would then be no longer any necessary identity between the period of rotation and that of revolution. A gleam of hope is thus projected over the astronomy of the distant future. We know that the time of revolution of the moon is increasing, and so long as the tidal governor could act,...
Σελίδα 22 - the attraction of the moon and sun on the equatorial protuberance of the earth causes the earth's axis to move slowly and continuously with reference to the fixed stars"; and that "throughout this precessional movement the obliquity of the equator to the ecliptic remains constant".
Σελίδα 31 - the general question of the limiting proximity of a liquid planet and satellite which just insures stability is not yet solved".
Σελίδα 21 - certain that a planet rotating primitively without obliquity would gradually become inclined to its orbit although probably not to so great an extent as we find in the case of the earth".

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