Thomas Harriot
Thomas Harriot was born in 1560 within the city of Oxford. He entered St Mary Hall, a college at Oxford University, and his name appeared in the hall's registry by 1577. After earning a bachelor's degree from that university, he turned his attention to navigation. This study focused on crossing the Atlantic Ocean to reach the New World. He utilized instruments like the astrolabe and sextants to aid these studies. Harriot educated himself using ideals from both astronomy and nautical science. He then taught other captains his navigational techniques while working for Sir Walter Raleigh. His findings were recorded in a document called the Articon but this text was later lost.
Harriot joined an expedition to Roanoke Island around 1585 funded by Sir Walter Raleigh. Sir Ralph Lane led this voyage to North Carolina. Two Native Americans named Wanchese and Manteo had been brought to England prior to the trip. Harriot spent many days with Manteo to learn the Carolina Algonquian language. He devised a phonetic alphabet specifically to transcribe their speech. As the only Englishman who knew Algonquin before the voyage, he became vital to the group. Harriot interrogated Manteo closely about life in the New World. He believed Indigenous peoples possessed intelligence despite having inferior technology. The account of this voyage appeared as A Briefe and True Report of the New Found Land of Virginia in 1588. That publication proved very influential upon later English explorers and colonists.
In early 1609 Harriot purchased a Dutch telescope known as a trunke. This instrument had been invented just one year earlier in 1608. On the 5th of August 1609 he drew a map of the Moon using that device. This drawing predates Galileo Galilei's first published observation by almost four months. Harriot used a six-power magnification for his lunar observations. By 1613 he had created two maps showing the whole Moon. These maps depicted lunar craters in correct relative positions. His drawings lacked some relief details along the light-dark terminator line. Critics like Terrie Bloom accused him of plagiarizing depictions from Galileo. Despite these accusations both descriptions were deemed valuable due to their different specific focuses. Harriot continued observing the Moon until 1612.
Around 1600 Harriot introduced an algebraic symbolism close to modern notation. He is credited with the first widespread use of inequality signs less than and greater than. He invented binary notation several decades before Gottfried Wilhelm Leibniz arrived on the scene. This system remained unknown to the public until the 1920s. Around 1620 his unpublished papers included the early basis of continuous compounding. Harriot used mathematical equations including logarithms and series calculations to illustrate concepts. The book Artis Analyticae Praxis appeared posthumously in Latin in 1631. Walter Warner edited this work but removed parts he did not understand. A full annotated English translation was not completed until 2007. Harriot also discovered Snell's law twenty years before Snellius published it.
Harriot worked for many years under Henry Percy the 9th Earl of Northumberland. They resided together at Syon House which was run by Thomas Percy. In 1595 the Duke gave property in Durham to Harriot moving him into landed gentry status. The Earl later provided Harriot a house on the estate to work on optics. Henry Percy fell from favor and was imprisoned in 1605 regarding the Gunpowder Plot. Harriot himself was interrogated and briefly imprisoned during that time. He was soon released after questioning ended. While incarcerated Harriot continued his astronomical work using notes from Halley's Comet observations in Ilfracombe. His sponsors began to fall from favor as Raleigh died first then Percy followed.
Harriot's accomplishments remain relatively obscure because he did not publish most results. Many manuscripts have been lost over centuries. Surviving papers reside in the British Museum and archives at Petworth House. An event held at Syon House celebrated the 400th anniversary of his Moon observations on the 26th of July 2009. Lord Egremont unveiled a plaque to commemorate Harriot during that ceremony. A crater on the Moon's far side bears his name since 1970. The observatory at College of William & Mary carries his honor. In December 2015 the International Astronomical Union named exoplanet 55 Cancri f after him. The Thomas Harriot College of Arts and Sciences exists at East Carolina University. His algebra book Artis Analyticae Praxis
remained unpublished until decades after his death.
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Common questions
When and where was Thomas Harriot born?
Thomas Harriot was born in 1560 within the city of Oxford. He entered St Mary Hall, a college at Oxford University, and his name appeared in the hall's registry by 1577.
What did Thomas Harriot do during the Roanoke Island expedition around 1585?
Thomas Harriot spent many days with Manteo to learn the Carolina Algonquian language and devised a phonetic alphabet specifically to transcribe their speech. His account of this voyage appeared as A Briefe and True Report of the New Found Land of Virginia in 1588.
How did Thomas Harriot observe the Moon before Galileo published his findings?
On the 5th of August 1609 he drew a map of the Moon using a Dutch telescope known as a trunke. This drawing predates Galileo Galilei's first published observation by almost four months and used six-power magnification for lunar observations.
What mathematical innovations did Thomas Harriot introduce around 1600?
Around 1600 Thomas Harriot introduced an algebraic symbolism close to modern notation and is credited with the first widespread use of inequality signs less than and greater than. He invented binary notation several decades before Gottfried Wilhelm Leibniz arrived on the scene.
Why was Thomas Harriot imprisoned in 1605 regarding the Gunpowder Plot?
Henry Percy fell from favor and was imprisoned in 1605 regarding the Gunpowder Plot so Harriot himself was interrogated and briefly imprisoned during that time. He was soon released after questioning ended while continuing astronomical work using notes from Halley's Comet observations in Ilfracombe.