of the nature of things-第37章
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But what can be throughout the universe；
In divers worlds on divers plan create；
This only do I show； and follow on
To assign unto the motions of the stars
Even several causes which 'tis possible
Exist throughout the universal All；
Of which yet one must be the cause even here
Which maketh motion for our constellations。
Yet to decide which one of them it be
Is not the least the business of a man
Advancing step by cautious step； as I。
Nor can the sun's wheel larger be by much
Nor its own blaze much less than either seems
Unto our senses。 For from whatso spaces
Fires have the power on us to cast their beams
And blow their scorching exhalations forth
Against our members； those same distances
Take nothing by those intervals away
From bulk of flames； and to the sight the fire
Is nothing shrunken。 Therefore； since the heat
And the outpoured light of skiey sun
Arrive our senses and caress our limbs；
Form too and bigness of the sun must look
Even here from earth just as they really be；
So that thou canst scarce nothing take or add。
And whether the journeying moon illuminate
The regions round with bastard beams； or throw
From off her proper body her own light；…
Whichever it be； she journeys with a form
Naught larger than the form doth seem to be
Which we with eyes of ours perceive。 For all
The far removed objects of our gaze
Seem through much air confused in their look
Ere minished in their bigness。 Wherefore； moon；
Since she presents bright look and clear…cut form；
May there on high by us on earth be seen
Just as she is with extreme bounds defined；
And just of the size。 And lastly； whatso fires
Of ether thou from earth beholdest； these
Thou mayst consider as possibly of size
The least bit less； or larger by a hair
Than they appear… since whatso fires we view
Here in the lands of earth are seen to change
From time to time their size to less or more
Only the least； when more or less away；
So long as still they bicker clear； and still
Their glow's perceived。
Nor need there be for men
Astonishment that yonder sun so small
Can yet send forth so great a light as fills
Oceans and all the lands and sky aflood；
And with its fiery exhalations steeps
The world at large。 For it may be； indeed；
That one vast…flowing well…spring of the whole
Wide world from here hath opened and out…gushed；
And shot its light abroad； because thuswise
The elements of fiery exhalations
From all the world around together come；
And thuswise flow into a bulk so big
That from one single fountain…head may stream
This heat and light。 And seest thou not； indeed；
How widely one small water…spring may wet
The meadow…lands at times and flood the fields？
'Tis even possible； besides； that heat
From forth the sun's own fire； albeit that fire
Be not a great； may permeate the air
With the fierce hot… if but； perchance； the air
Be of condition and so tempered then
As to be kindled； even when beat upon
Only by little particles of heat…
Just as we sometimes see the standing grain
Or stubble straw in conflagration all
From one lone spark。 And possibly the sun；
Agleam on high with rosy lampion；
Possesses about him with invisible heats
A plenteous fire； by no effulgence marked；
So that he maketh； he； the Fraught…with…fire；
Increase to such degree the force of rays。
Nor is there one sure cause revealed to men
How the sun journeys from his summer haunts
On to the mid…most winter turning…points
In Capricorn； the thence reverting veers
Back to solstitial goals of Cancer； nor
How 'tis the moon is seen each month to cross
That very distance which in traversing
The sun consumes the measure of a year。
I say； no one clear reason hath been given
For these affairs。 Yet chief in likelihood
Seemeth the doctrine which the holy thought
Of great Democritus lays down： that ever
The nearer the constellations be to earth
The less can they by whirling of the sky
Be borne along； because those skiey powers
Of speed aloft do vanish and decrease
In under…regions； and the sun is thus
Left by degrees behind amongst those signs
That follow after； since the sun he lies
Far down below the starry signs that blaze；
And the moon lags even tardier than the sun：
In just so far as is her course removed
From upper heaven and nigh unto the lands；
In just so far she fails to keep the pace
With starry signs above； for just so far
As feebler is the whirl that bears her on；
（Being； indeed； still lower than the sun）；
In just so far do all the starry signs；
Circling around； o'ertake her and o'erpass。
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。
Matuta also at a fixed hour
Spreadeth the roseate morning out along
The coasts of heaven and deploys the light；
Either because the self…same sun； returning
Under the lands； aspires to seize the sky；
Striving to set it blazing with his rays
Ere he himself appear； or else because
Fires then will congregate and many seeds
Of heat are wont； even at a fixed time；
To stream together… gendering evermore
New suns and light。 Just so the story goes
That from the Idaean mountain…tops are seen
Dispersed fires upon the break of day
Which thence combine； as 'twere； into one ball
And form an orb。 Nor yet in these affairs
Is aught for wonder that these seeds of fire
Can thus together stream at time so fixed
And shape anew the splendour of the sun。
For many facts we see which come to pass
At fixed time in all things： burgeon shrubs
At fixed time； and at a fixed time
They cast their flowers； and Eld commands the teeth；
At time as surely fixed； to drop away；
And Youth commands the growing boy to bloom
With the soft down and let from both his cheeks
The soft beard fall。 And lastly； thunder…bolts；
Snow； rains； clouds； winds； at seasons of the year
Nowise unfixed； all do come to pass。
For where； even from their old primordial start
Causes have ever worked in such a way；
And where； even from the world's first origin；
Thuswise have things befallen； so even now
After a fixed order they come round
In sequence also。
Likewise； days may wax
Whilst the nights wane； and daylight minished be
Whilst nights do take their augmentations；
Either because the self…same sun； coursing
Under the lands and over in two arcs；
A longer and a briefer； doth dispart
The coasts of ether and divides in twain
His orbit all unequally； and adds；
As round he's borne； unto the one half there
As much as from the other half he's ta'en；
Until he then arrives that sign of heaven
Where the year's node renders the shades of night
Equal unto the periods of light。
For when the sun is midway on his course
Between the blasts of northwind and of south；
Heaven keeps his two goals parted equally；
By virtue of the fixed position old
Of the whole starry Zodiac； through which
That sun； in winding onward； takes a year；
Illumining t
