Kitap 5
All there- those under-realms below her heights-
There to be overset in whirlwinds wild,-
Doth leave all there to brawl in wayward gusts,
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Whilst, gliding with a fixed impulse still,
Itself it bears its fires along. For, lo,
That ether can flow thus steadily on, on,
With one unaltered urge, the Pontus proves-
That sea which floweth forth with fixed tides,
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Keeping one onward tenor as it glides.
Now let us sing what makes the stars to move.
In first place, if the mighty sphere of heaven
Revolveth round, then needs we must aver
That on the upper and the under pole
Presses a certain air, and from without
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Confines them and encloseth at each end;
And that, moreover, another air above
Streams on athwart the top of the sphere and tends
In same direction as are rolled along
The glittering stars of the eternal world;
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Or that another still streams on below
