Is Shelley's science actually correct?

Partly. The Earth's axial tilt changes over a cycle of about 41,000 years (the Milankovitch cycle), and it is currently on a very slow decline. Shelley's sources, especially Laplace, were credible. However, his jump from physical astronomy to moral progress isn't scientific; it's more of a philosophical argument presented as science. The fossil and paleoclimate evidence he references aligns generally with current understanding, though his interpretation leans toward the optimistic side.

Why does Shelley connect the Earth's tilt to human morality?

He was operating within a materialist tradition that viewed the human mind and body as shaped by their physical surroundings. When the climate becomes more stable, our bodies tend to be healthier; healthier bodies lead to better functioning minds; and improved minds contribute to fairer societies. It's a chain reaction that connects astronomy to politics.

Who are Laplace, Cabanis, and Bailly, and why does Shelley cite them?

Pierre-Simon Laplace was the leading French astronomer of his time, and his *Système du Monde* became the go-to reference for celestial mechanics. Pierre-Jean-Georges Cabanis, a French physician and philosopher, contended that our mental experiences arise from physical processes. Jean-Sylvain Bailly, an astronomer and historian, investigated ancient civilizations. Shelley references these figures to demonstrate that his utopian ideas are grounded in established European science rather than just fanciful notions.

What does 'obliquity' mean in this context?

It refers to the angle at which the Earth's axis tilts in relation to its orbit around the Sun. Right now, this angle is approximately 23.5 degrees. Shelley suggests that as this angle approaches zero, the seasonal differences will lessen, leading to a uniformly mild climate across the entire planet throughout the year.

Why was *Queen Mab* controversial?

It criticized the monarchy, organized religion (particularly Christianity), the institution of marriage, and the meat trade all at once. The prose notes are even clearer than the poem itself. Although Shelley never formally published the poem during his life—he printed 250 copies for private distribution—pirated versions spread widely, making it a key reference for radical and freethinking movements in the early nineteenth century.

What is the 'torrid zone' Shelley mentions?

It's the historical geographical term for the tropical zone around the equator — the area between the Tropics of Cancer and Capricorn. For Shelley, discovering bones of tropical animals in Siberia proved that the Earth's climate used to be much more consistent than it is now.

How do these footnotes relate to Shelley's other famous poems?

The same belief in slow yet certain progress toward a better world is present in *Prometheus Unbound* (1820) and *Hellas* (1822). While the scientific perspective is distinctive to *Queen Mab*, the core idea — that the universe moves toward freedom — links all of Shelley's significant works.

The Annotated Edition

45, 46:— by Percy Bysshe Shelley

Summary, meaning, line-by-line analysis & FAQ.

Read aloud in ~3 minOpen reading mode →

This text isn't just a standalone poem; it's actually two footnotes (numbered 45 and 46) from Shelley's lengthy philosophical work *Queen Mab*, connected to a fragment about a dim, reddish sun.

Poet: Percy Bysshe Shelley
Themes: freedom, hope, nature

The PoemFull text

45, 46:—

Percy Bysshe Shelley

To the red and baleful sun That faintly twinkles there. The north polar star, to which the axis of the earth, in its present state of obliquity, points. It is exceedingly probable, from many considerations, that this obliquity will gradually diminish, until the equator coincides with the ecliptic: the nights and days will then become equal on the earth throughout the year, and probably the seasons also. There is no great extravagance in presuming that the progress of the perpendicularity of the poles may be as rapid as the progress of intellect; or that there should be a perfect identity between the moral and physical improvement of the human species. It is certain that wisdom is not compatible with disease, and that, in the present state of the climates of the earth, health, in the true and comprehensive sense of the word, is out of the reach of civilized man. Astronomy teaches us that the earth is now in its progress, and that the poles are every year becoming more and more perpendicular to the ecliptic. The strong evidence afforded by the history of mythology, and geological researches, that some event of this nature has taken place already, affords a strong presumption that this progress is not merely an oscillation, as has been surmised by some late astronomers. (Laplace, “Systeme du Monde”.) Bones of animals peculiar to the torrid zone have been found in the north of Siberia, and on the banks of the river Ohio. Plants have been found in the fossil state in the interior of Germany, which demand the present climate of Hindostan for their production. (Cabanis, “Rapports du Physique et du Moral de l’Homme”, volume 2 page 406.) The researches of M. Bailly establish the existence of a people who inhabited a tract in Tartary 49 degrees north latitude, of greater antiquity than either the Indians, the Chinese, or the Chaldeans, from whom these nations derived their sciences and theology. (Bailly, “Lettres sur les Sciences, a Voltaire”.) We find, from the testimony of ancient writers, that Britain, Germany, and France were much colder than at present, and that their great rivers were annually frozen over. Astronomy teaches us also that since this period the obliquity of the earth’s position has been considerably diminished.

§01Quick summary

What this poem is about

This text isn't just a standalone poem; it's actually two footnotes (numbered 45 and 46) from Shelley's lengthy philosophical work *Queen Mab*, connected to a fragment about a dim, reddish sun. In these notes, Shelley suggests that the Earth's axis is gradually straightening. He believes that once this happens, the planet's climate will achieve perfect balance, and so too will human society. Essentially, he's arguing that physical nature and moral advancement are intertwined, proposing that a golden age is not merely a myth but a scientific forecast.

§02Themes

Recurring themes

§03Line by line

Stanza by stanza, with notes

To the red and baleful sun / That faintly twinkles there.
Editor's note
This two-line verse fragment serves as the foundation for both footnotes. The 'red and baleful sun' represents the pole star from a future or altered Earth — dim and foreboding, indicating the planet's current tilted and flawed condition. The term 'baleful' (meaning harmful or threatening) suggests that the existing arrangement of the cosmos is neither final nor ideal. Shelley then employs the footnotes to clarify *why* the current situation is negative and *how* it can get better.
The north polar star, to which the axis of the earth, in its present state of obliquity, points...
Editor's note
Footnote 45 starts with an intriguing astronomical fact — the Earth's axial tilt — and evolves it into an idealistic argument. Shelley references Laplace's *Système du Monde* to suggest that the poles are slowly becoming more perpendicular to the ecliptic (which means the tilt is lessening). Then he takes a bold leap: this physical straightening could occur at the same pace as human intellectual development. Equal days and nights around the globe would result in equal seasons, improved health, and ultimately a more enlightened, fair society. While the reasoning leans more towards poetry than strict science, Shelley delivers it with the assurance of someone well-read.
Bones of animals peculiar to the torrid zone have been found in the north of Siberia...
Editor's note
Footnote 46 adds more weight to the argument. Shelley draws on fossil records, paleobotany, and the historical work of the French astronomer Bailly to demonstrate that the Earth has *already* experienced a significant climatic shift — with tropical animals found in Siberia, Indian-climate plants preserved as fossils in Germany, and ancient rivers in Britain and France that used to freeze solid now remaining unfrozen. He argues that this isn't just speculation; it's a part of our history. The Earth has changed in the past, it is changing right now, and the current trend indicates a shift toward a warmer, more balanced world. For Shelley, this future world goes hand in hand with a more balanced human society.

§04Tone & mood

How this poem feels

The tone strikes a balance between urgency and optimism—it's the voice of a young man who has immersed himself in literature and wants you to share in the excitement of the evidence he's gathered. There's no trace of sadness here. Shelley writes these notes like a dedicated student presenting a thesis: citing influential figures (Laplace, Cabanis, Bailly), building a strong case with examples, and arriving at a conclusion that feels almost unavoidable. The short verse fragment that kicks off the notes carries a darker, more foreboding tone—'baleful'—but the prose swiftly shifts back to a sense of hope. The overall impression is of someone genuinely thrilled by the universe's slow, intricate workings.

§05Symbols & metaphors

Symbols & metaphors

The red and baleful sun: The pole star appears dim, reddish, and ominous in today's conditions. It symbolizes the Earth's current imperfect tilt and reflects the flawed state of human civilization: troubled, unequal, and still not entirely rational.
Axial obliquity (the Earth's tilt): The physical representation of all that’s wrong with the world. While the axis remains tilted, we face unequal seasons, extreme climates, compromised health, and wisdom that feels just out of reach. Its slow correction drives us toward a better future.
Fossil bones and plants: Material proof exists that the world has been different before — warmer and more uniform — and therefore *can* be different again. This serves as evidence against despair and supports the possibility of radical change.
The equator coinciding with the ecliptic: The ideal outcome Shelley envisions is an Earth standing perfectly upright, where days and seasons are equal, and everyone enjoys equal health. It serves as a secular paradise, a scientific take on the golden age.
Frozen rivers of Britain and France: Historical testimony shows that climate has shifted dramatically within our recorded history. This frames the argument in the context of human experience instead of distant astronomical concepts, making the upcoming changes feel tangible and imminent.

§06Historical context

Historical context

These footnotes can be found in *Queen Mab: A Philosophical Poem* (1813), a work Shelley wrote when he was just nineteen and published himself at twenty. The poem is a bold critique of monarchy, religion, war, and commerce, with its prose notes almost matching the length of the verses. Shelley used these notes to anchor his radical ideas in science, philosophy, and history. He tapped into the French materialist tradition (think Cabanis and Holbach) and the Enlightenment astronomy of Laplace. The belief that moral and physical progress are interconnected was a shared notion among radicals of the time, and Shelley took it to its extreme. *Queen Mab* was suppressed and circulated secretly, becoming a key text for early British working-class radicals. Although Shelley later sought to distance himself from its more provocative sections, the scientific optimism expressed in these notes continued to influence his thoughts throughout his brief life.

§07FAQ

Questions readers ask

They are notes for *Queen Mab: A Philosophical Poem* (1813), which is Shelley's first significant work. The line 'To the red and baleful sun / That faintly twinkles there' can be found in the poem, with footnotes 45 and 46 added to clarify the astronomical and geological concepts related to it.

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45, 46:— by Percy Bysshe Shelley

45, 46:—

What this poem is about

Recurring themes

Stanza by stanza, with notes

How this poem feels

Symbols & metaphors

Historical context

Questions readers ask

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