The Last Magician
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During the plague closures of 1665–1667, Newton returned to Woolsthorpe and advanced his work on calculus, colours, and gravity. His later account of a falling apple belongs to this period, though a complete theory of universal gravitation took another two decades. The discoveries grew from earlier mathematics and experiments, then reshaped the study of the physical world.
“If I have seen further it is by standing on the shoulders of Giants.”
1643–1727
Born on Christmas Day 1642 (Old Style) at Woolsthorpe Manor, Lincolnshire. Died in Kensington, London, aged 84 — honoured with burial at Westminster Abbey.
1687
The Philosophiae Naturalis Principia Mathematica — one of the most influential works in the history of science — laid out the three laws of motion and the law of universal gravitation.
24 years
Elected president of the Royal Society in 1703, re-elected annually until his death in 1727. He wielded the position with absolute authority.
28 years
Oversaw the Great Recoinage of 1696, pursued counterfeiters with obsessive zeal, and made a recommendation in 1717 that helped Britain move toward a de facto gold standard.
Laws of motion, universal gravitation, calculus, optics, Principia Mathematica
Defining Events
The Annus Mirabilis
When plague closed Cambridge University, Newton retreated to his mother's farmhouse at Woolsthorpe Manor. In eighteen extraordinary months, he developed the method of fluxions (calculus), conducted his prism experiments proving that white light is composed of a spectrum of colours, and began formulating the theory of universal gravitation. He was in his early twenties. Newton himself later called these months the period in which he was 'in the prime of my age for invention.'
The Principia
In August 1684, the astronomer Edmond Halley visited Cambridge and asked Newton what curve a planet would describe under an inverse-square law of attraction. Newton answered immediately: 'An ellipse.' He had already proved it. Halley persuaded him to publish, and over eighteen months of obsessive work, Newton expanded a nine-page treatise into three books that explained the motion of everything from falling apples to orbiting planets. The Philosophiae Naturalis Principia Mathematica was published in 1687, financed by Halley himself after the Royal Society spent its book budget on a history of fish.
The Reflecting Telescope
Frustrated by the chromatic aberration that plagued refracting telescopes — coloured fringes caused by lenses bending different wavelengths at different angles — Newton designed and built the first practical reflecting telescope. Only about eight inches long, it used a concave mirror he ground himself from speculum metal. The instrument could magnify forty times and clearly showed Jupiter's four Galilean moons and the crescent phase of Venus. Newton's design principle remains the basis of most modern research telescopes, including the Hubble Space Telescope.
Timeline
Born at Woolsthorpe Manor
Born on Christmas Day 1642 (Old Style) at Woolsthorpe Manor, Lincolnshire — so premature his mother said he could fit inside a quart mug. His father, an illiterate yeoman farmer, had died three months earlier. Newton would grow up fatherless, abandoned by his mother at age three when she remarried.
Enters Trinity College, Cambridge
Admitted to Trinity College as a subsizar — the lowest rank, paying his way by carrying meals and emptying chamber pots for wealthier students. Ignored the Aristotelian curriculum and privately devoured Descartes, Galileo, and Kepler. His genius went entirely unnoticed by his tutors.
The Plague Years
Cambridge closed due to the Great Plague. Newton retreated to Woolsthorpe and experienced an extraordinarily productive period — developing calculus, decomposing white light with prisms, and beginning work on universal gravitation. He was in his early twenties.
Lucasian Professor of Mathematics
Isaac Barrow, the first Lucasian Professor, recognised Newton's genius and voluntarily ceded the prestigious chair to his twenty-six-year-old protégé — one of the most consequential acts of academic generosity in history.
First Published Paper
Published 'A Letter containing his New Theory about Light and Colours' in the Philosophical Transactions of the Royal Society. Robert Hooke publicly criticised the paper, beginning a feud that would last three decades and shape the course of British science.
Principia Mathematica Published
The Philosophiae Naturalis Principia Mathematica — three books laying out the laws of motion and universal gravitation — was published with Edmond Halley's financial support. It explained the motion of planets, tides, comets, and projectiles in a single unified framework. Nothing like it had ever been written.
The Nervous Breakdown
In 1693, Newton suffered a mental collapse. He wrote paranoid letters to Samuel Pepys and John Locke, accusing them of conspiring against him. Poisoning from laboratory exposure has been proposed, but the cause cannot be established from surviving evidence.
Warden of the Royal Mint
Appointed Warden of the Royal Mint and moved to London. Oversaw the Great Recoinage — smelting and re-minting most of England's money supply. Pursued counterfeiters with the zeal of a detective, personally gathering over 200 depositions and sending William Chaloner to the gallows.
Key Figures
Robert Hooke
Curator of Experiments at the Royal Society, brilliant polymath, and Newton's most persistent antagonist. Hooke publicly attacked Newton's 1672 optics paper, contributing to Newton's reluctance to publish, though he continued to send work to the Society. During the preparation of the Principia, Hooke claimed priority for the inverse-square law of gravitation — Newton was so incensed he threatened to suppress Book III entirely. Newton withheld publication of Opticks until after Hooke's death in 1703. The familiar story that he destroyed or removed Hooke's portrait lacks firm evidence.
Edmond Halley
The astronomer whose August 1684 visit to Cambridge drew out Newton's proof that planetary orbits follow an inverse-square law — the conversation that led directly to the Principia. When the Royal Society could not fund publication, Halley personally financed the printing, edited the manuscript, smoothed over the explosive Hooke-Newton priority dispute, and ensured the most important scientific work in history reached the world. Without Halley, the Principia might never have been published.
The Legacy of Isaac Newton
Newton's laws of motion provided the dominant framework of mechanics for over two centuries — until Einstein's theory of relativity revealed their limits at the extremes of speed and gravity. But in the everyday world of falling objects, orbiting satellites, and engineered structures, Newton's equations remain highly accurate and indispensable in their appropriate range. The unit of force bears his name. The reflecting telescope he invented in his Cambridge rooms remains the basis of modern astronomical instruments. And the calculus he developed in a Lincolnshire farmhouse during a plague is the mathematical language in which all of modern physics, engineering, and economics is written.
He was also an alchemist who wrote over a million words seeking the Philosopher's Stone. A secret heretic who rejected the Holy Trinity. A vindictive rival who systematically destroyed the reputations of those who crossed him. And a man who, near the end of his life, described himself in an often-quoted recollection as a boy playing on the seashore, 'diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.' Read his story in his own words — the first-person ePub brings you inside Newton's mind.
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