Date context
1643–1727 (Gregorian calendar)
Education and calendar dates
Newton was born at Woolsthorpe in Lincolnshire. His birthday was 4 January 1643 in the Gregorian calendar, corresponding to 25 December 1642 in the Julian calendar then used in England. The two birth years found in biographies reflect this calendar difference.
He entered Trinity College, Cambridge, in 1661 and became Lucasian Professor of Mathematics in 1669. His investigations developed through mathematical notes, experiments and correspondence before appearing in his major books.
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Motion and gravitation
The Principia, published in 1687, applied laws of motion and universal gravitation to terrestrial and celestial problems. Its mathematical arguments connected planetary orbits with a more general account of motion, bringing calculations into comparison with observations.
Edmond Halley helped bring the work to publication. The manuscript preserved by the Royal Society records a process of revision and printing, placing the book within the observational and scholarly networks on which Newton drew.
Optics and mathematical methods
Newton investigated white light and colour with prisms and constructed a reflecting telescope. Opticks, published in 1704, combined experiments, arguments and questions for further research, using a different presentation from the mathematical structure of the Principia.
His mathematical work also addressed rates of change and curves. The later priority dispute with Gottfried Wilhelm Leibniz involved distinctions between private investigation, correspondence and publication, rather than a single date of invention.
References: [1]
Institutions and public work
Newton moved to the Royal Mint in London in 1696 and later became its Master, working on recoinage and counterfeiting. He was elected President of the Royal Society in 1703 and held that office until his death in 1727.
His surviving papers also document alchemy, religion and ancient chronology. These interests locate his scientific achievements within the broader intellectual world of seventeenth-century natural philosophy.
References: [1]