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Lucretius, 94? BC-49? BC

"On the Nature of Things"


Therefore it happens that the moon appears
More swiftly to return to any sign
Along the Zodiac, than doth the sun,
Because those signs do visit her again
More swiftly than they visit the great sun.
It can be also that two streams of air
Alternately at fixed periods
Blow out from transverse regions of the world,
Of which the one may thrust the sun away
From summer-signs to mid-most winter goals
And rigors of the cold, and the other then
May cast him back from icy shades of chill
Even to the heat-fraught regions and the signs
That blaze along the Zodiac. So, too,
We must suppose the moon and all the stars,
Which through the mighty and sidereal years
Roll round in mighty orbits, may be sped
By streams of air from regions alternate.
Seest thou not also how the clouds be sped
By contrary winds to regions contrary,
The lower clouds diversely from the upper?
Then, why may yonder stars in ether there
Along their mighty orbits not be borne
By currents opposite the one to other?
But night o'erwhelms the lands with vasty murk
Either when sun, after his diurnal course,
Hath walked the ultimate regions of the sky
And wearily hath panted forth his fires,
Shivered by their long journeying and wasted
By traversing the multitudinous air,
Or else because the self-same force that drave
His orb along above the lands compels
Him then to turn his course beneath the lands.


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