The scientific examination of a solar eclipse, the exact astronomical calculations to determine the dates and times of their manifestations, with diagrams, and advice on how to observe them; it all detracts from the poetry. The sky darkens, and the birds fly to their roosts, the land falls silent, if for a few minutes before some very puzzled birds start their song again.
Before Copernicus discovered real astronomy, men of learning knew that the Moon passing over the Sun causes the latter to be eclipsed. Dante settled down to writing a scientific description of an eclipse, using it to examine and refute the idea that the patches on the Moon are the result o differing densities of matter. However he was Dante, an extraordinary poet, reviving the lost art of the Roman writers, and he could no more write it as a dull scientific treatise than I could imitate him:
She somewhat smil’d, then spake: “If mortals err
In their opinion, when the key of sense
Unlocks not, surely wonder’s weapon keen
Ought not to pierce thee; since thou find’st, the wings
Of reason to pursue the senses’ flight
Are short. But what thy own thought is, declare.”
Then I: “What various here above appears,
Is caus’d, I deem, by bodies dense or rare.”
She then resum’d: “Thou certainly wilt see
In falsehood thy belief o’erwhelm’d, if well
Thou listen to the arguments, which I
Shall bring to face it. The eighth sphere displays
Numberless lights, the which in kind and size
May be remark’d of different aspects;
If rare or dense of that were cause alone,
One single virtue then would be in all,
Alike distributed, or more, or less.
Different virtues needs must be the fruits
Of formal principles, and these, save one,
Will by thy reasoning be destroy’d. Beside,
If rarity were of that dusk the cause,
Which thou inquirest, either in some part
That planet must throughout be void, nor fed
With its own matter; or, as bodies share
Their fat and leanness, in like manner this
Must in its volume change the leaves. The first,
If it were true, had through the sun’s eclipse
Been manifested, by transparency
Of light, as through aught rare beside effus’d.
But this is not. Therefore remains to see
The other cause: and if the other fall,
Erroneous so must prove what seem’d to thee.
If not from side to side this rarity
Pass through, there needs must be a limit, whence
Its contrary no further lets it pass.
And hence the beam, that from without proceeds,
Must be pour’d back, as colour comes, through glass
Reflected, which behind it lead conceals.
Now wilt thou say, that there of murkier hue
Than in the other part the ray is shown,
By being thence refracted farther back.
From this perplexity will free thee soon
Experience, if thereof thou trial make,
The fountain whence your arts derive their streame.
from Divina Commedia: Paradiso by Dante Alighieri, trans. The Rev. H F Cary MA
See also
Books
- By Dante Alighieri:
- The Divine Comedy (tr. Robert Kirkpatrick)
- Love That Moves the Sun and Other Stars (tr. Robert Kirkpatrick)
- Vita Nuova (tr Barbara Reynolds)
- Dante’s Paradiso and the Limitations of Modern Criticism by Robert Kirkpatrick
- Chasing the Moon: The Story of the Space Race – from Arthur C. Clarke to the Apollo Landings by Robert Stone
- Leviathan by Thomas Hobbes
- The Elements of Law Natural and Politic, Parts I & II by Thomas Hobbes