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{{short description|Portuguese mathematician (1502–1578)}}
{{For|the racing driver|Pedro Nunes (racing driver)}} {{For|the racing driver|Pedro Nunes (racing driver)}}
{{Infobox person {{Infobox person
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|nationality = ] |nationality = ]
|citizenship = |citizenship =
|occupation = ], ], and ] |occupation = ], ], and ]
|known_for = |known_for =
|signature = Assinatura Pedro Nunes.svg |signature = Assinatura Pedro Nunes.svg
}} }}
'''Pedro Nunes''' ({{IPA-pt|ˈpedɾu ˈnunɨʃ|lang}}; ]: ''Petrus Nonius''; 1502 &ndash; 11 August 1578)<ref></ref> was a ] ], ], and ], from a ] (of ]ish origin) family.<ref>Martins, Jorge, ''Portugal e os Judeus'' (3 vol.), Nova Vega, Lisboa, 2006, {{ISBN|972-699-847-6}}</ref><ref>{{cite web '''Pedro Nunes''' ({{IPA|pt|ˈpeðɾu ˈnunɨʃ|lang}}; ]: ''Petrus Nonius''; 1502 &ndash; 11 August 1578)<ref>{{cite web | url=http://galileo.rice.edu/Catalog/NewFiles/nunez.html | title=The Galileo Project }}</ref> was a ] ], ], and ], probably from a ] (of ]ish origin) family.<ref>Martins, Jorge, ''Portugal e os Judeus'' (3 vol.), Nova Vega, Lisboa, 2006, {{ISBN|972-699-847-6}}</ref><ref name="Leitão, Henrique 2003">Leitão, Henrique, "Para uma biografia de Pedro Nunes: O surgimento de um matemático, 1502-1542", ''Cadernos de Estudos Sefarditas'', 3 (2003) 45-82.</ref><ref>{{cite web
| url = http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Nunes.html | url = http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Nunes.html
| title = Pedro Nunes Salaciense | title = Pedro Nunes Salaciense
| author = J J O'Connor | author = J J O'Connor
| date = November 2010 | date = November 2010
| accessdate = 2015-11-20 | access-date = 2015-11-20
}}</ref> }}</ref>


Nunes, considered to be one of the greatest mathematicians of his time,<ref></ref> is best known for his contributions in the nautical sciences (navigation and cartography), which he approached, for the first time, in a mathematical way. He was the first to propose the idea of a ], and was the inventor of several measuring devices, including the ] (from which ] was derived), named after his Latin surname.<ref name=source1 /> Considered one of the greatest mathematicians of his time,<ref></ref> Nunes is best known for being the first to approach navigation and cartography with mathematical tools. Among other accomplishments, he was the first to propose the idea of a ] (a ]), and was the inventor of several measuring devices, including the ] (from which the ] was derived), named after his Latin surname.<ref name="source1">{{cite web |last1=O'Connor |first1=J. J. |last2=Robertson |first2=E. F. |date=November 2010 |title=Biography of Pedro Nunes Salaciense |url=http://www-history.mcs.st-and.ac.uk/Biographies/Nunes.html |access-date=2014-04-08 |publisher=School of Mathematics and Statistics, University of St Andrews, Scotland}}</ref>


== Life == == Life ==
Little is known about Nunes' early education, life or family background, only that he was born in ], his origins are ] and that his grandchildren spent a few years behind bars after they were accused by the ] of professing and secretly practicing Judaism.<ref name=source3> Little is known about Nunes' early education, life or family background, only that he was born in ] in Portugal, his origins are possibly ] and that his grandchildren spent a few years behind bars after they were accused by the ] of professing and secretly practicing Judaism.<ref name="Leitão, Henrique 2003"/><ref name=source3>
</ref> He studied at the ], maybe from 1521 until 1522, and at the University of Lisbon (this University later become the ]) where he obtained a degree in ] in 1525. In the 16th century medicine used ], so he also learned ] and ].<ref name=source1>{{cite web |url=http://www-history.mcs.st-and.ac.uk/Biographies/Nunes.html |title=Biography of Pedro Nunes Salaciense |last1=O'Connor |first1=J. J. |last2=Robertson |first2=E. F. |date=November 2010 |website= |publisher=School of Mathematics and Statistics, University of St Andrews, Scotland |accessdate=2014-04-08}}</ref> </ref> He studied at the ], maybe from 1517 until 1522. He returned to Lisbon c. 1529 and started teaching at the University.


He continued his medical studies but held various ] posts within the ], including ], ], ] and ]. When, in 1537, the Portuguese University located in ] returned to ], he moved to the re-founded University of Coimbra to teach mathematics, a post he held until 1562.<ref>{{Cite web|url=http://www-groups.dcs.st-and.ac.uk/history/Biographies/Nunes.html|title=Pedro Nunes (1502-1578)|website=www-groups.dcs.st-and.ac.uk|access-date=2019-02-08}}</ref> This was a new post in the University of Coimbra and it was established to provide instruction in the technical requirements for navigation: clearly a topic of great importance in ] at this period, when the control of sea trade was the primary source of Portuguese wealth. Mathematics became an independent post in 1544.<ref name=source1 /> He continued his medical studies but held various ] posts within the ], including ], ], ] and ]. He obtained his doctorate in ] in 1532. When, in 1537, the Portuguese University located in ] returned to ], he moved to the re-founded University of Coimbra to teach mathematics, a post he held until 1562.<ref>{{Cite web|url=http://www-groups.dcs.st-and.ac.uk/history/Biographies/Nunes.html|title=Pedro Nunes (1502-1578)|website=www-groups.dcs.st-and.ac.uk|access-date=2019-02-08}}</ref> This was a new post in the University of Coimbra and it may have been established to provide instruction in the technical requirements for navigation: clearly a topic of great importance in ] at this period, when the control of sea trade was the primary source of Portuguese wealth. Mathematics became an independent post in 1544.<ref name=source1 />


In addition to teaching he was appointed Royal Cosmographer in 1529 and Chief Royal Cosmographer in 1547: a post which he held until his death.<ref name=source1 /> In addition to teaching he was appointed Royal Cosmographer in 1529 and Chief Royal Cosmographer in 1547: a post which he held until his death.<ref name=source1 />


In 1531, King ] charged Nunes with the education of his younger brothers Luís and ]. Years later Nunes was also charged with the education of the king's grandson, and future king, ].<ref name=source1 /> In 1531, King ] charged Nunes with the education of his younger brothers ] and ]. Years later Nunes was also charged with the education of the king's grandson, and future king, ].<ref name=source1 />


While at the University of Coimbra, future astronomer ] attended Pedro Nunes' classes, and was influenced by his works.<ref name=source1 /> Clavius, proponent of the ], the greatest figure of the Colégio Romano, the great center of Roman Catholic knowledge of that period, classified Nunes as “supreme mathematical genius".<ref name=source3 /> Nunes died in ]. It is possible that, while at the University of Coimbra, future astronomer ] attended Pedro Nunes' classes, and was influenced by his works.<ref name=source1 /> Clavius, proponent of the ], the greatest figure of the Colégio Romano, the great center of Roman Catholic knowledge of that period, classified Nunes as “supreme mathematical genius".<ref name=source3 /> Nunes died in ].


== Work == == Work ==
Pedro Nunes lived in a transition period, during which science was changing from valuing theoretical knowledge (which defined the main role of a scientist/mathematician as commenting on previous authors), to providing ]al data, both as a source of information and as a method of confirming theories. Nunes was, above all, one of the last great commentators,<ref>{{citation|last1 =Fernández|first1=V.V.|last2=Rodrigues Jr.|first2=W.A.|title=Gravitation as a Plastic Distortion of the Lorentz Vacuum|year = 2010|publisher = Springer-Verlag|language=|location=Berlin Heidelberg|page=5|isbn=978-3-642-13589-7|arxiv=0909.4472|doi=10.1007/978-3-642-13589-7|bibcode=2010gpdl.book.....F}}</ref> as is shown by his first published work “Tratado da Esfera”, enriched with comments and additions that denote a profound knowledge of the difficult cosmography of the period.<ref name=source3 /> He also acknowledged the value of experimentation. Pedro Nunes lived in a transition period, during which science was changing from valuing theoretical knowledge (which defined the main role of a scientist/mathematician as commenting on previous authors), to providing ]al data, both as a source of information and as a method of confirming theories. Nunes was, above all, one of the last great commentators,<ref>{{citation|last1 =Fernández|first1=V.V.|last2=Rodrigues Jr.|first2=W.A.|title=Gravitation as a Plastic Distortion of the Lorentz Vacuum|year = 2010|publisher = Springer-Verlag|location=Berlin Heidelberg|page=5|isbn=978-3-642-13589-7|arxiv=0909.4472|doi=10.1007/978-3-642-13589-7|bibcode=2010gpdl.book.....F|s2cid=115171595 }}</ref> as is shown by his first published work “Tratado da Esfera”, enriched with comments and additions that denote a profound knowledge of the difficult cosmography of the period.<ref name=source3 /> He also acknowledged the value of experimentation.


In his ''Tratado da sphera'' he argued for a common and universal diffusion of knowledge.<ref>«''o bem, quanto mais comum e universal, tanto é mais excelente''» quoted by Calafate, Pedro (see above)</ref> Accordingly, he not only published works in ], at that time science's ], aiming for an audience of European scholars, but also in ], and ] (''Livro de Algebra''). In his ''Tratado da sphera'' he argued for a common and universal diffusion of knowledge.<ref>«''o bem, quanto mais comum e universal, tanto é mais excelente''» quoted by Calafate, Pedro (see above)</ref> Accordingly, he not only published works in ], at that time science's ], aiming for an audience of European scholars, but also in ], and ] (''Livro de Algebra'').
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===Navigation=== ===Navigation===
] showing the well-known navigators. Left to right: ] (cosmographer and chart maker), ] (navigator), Pedro Nunes (shown holding an ]), ] (navigator), ] (navigator) and finally ] (navigator)]] ] showing the well-known navigators. Left to right: ] (cosmographer and chart maker), ] (navigator), Pedro Nunes (shown holding an ]), ] (navigator), ] (navigator) and finally ] (navigator)]]
Much of Nunes' work related to ]. He was the first to understand why a ship maintaining a steady ] would not travel along a ], the shortest path between two points on Earth, but would instead follow a ] course, called a ].<ref name=source3 /> The later invention of ]s allowed ] to establish ]s for the loxodrome.<ref></ref> These lines —also called ]s— maintain a fixed angle with the ]s. In other words, loxodromic curves are directly related to the construction of the Nunes ] —also called navigator connection.<ref>In ], Nunes connection is an example of ] which ] showed to ] in 1922 when he visited ].</ref> Much of Nunes' work related to ]. He was the first to understand why a ship maintaining a steady ] would not travel along a ], the shortest path between two points on Earth, but would instead follow a ] course, called a ].<ref name=source3 /> These lines —also called ]s— maintain a fixed angle with the ]s. In other words, loxodromic curves are directly related to the construction of the Nunes ] —also called navigator connection.<ref>In ], Nunes connection is an example of ] which ] showed to ] in 1922 when he visited ].</ref>


In his ''Treaty defending the sea chart'', Nunes argued that a ] should have its ] and meridians shown as straight lines. Yet he was unsure how to solve the problems that this caused: a situation that lasted until ] developed the ] bearing his name. The ] is the system which is still used. In his ''Treaty defending the sea chart'', Nunes argued that a ] should have its ] and meridians shown as straight lines. Yet he was unsure how to solve the problems that this caused: a situation that lasted until ] developed the ] bearing his name. The ] is the system which is still used.


===Geometry=== ===Geometry===
Nunes also solved the problem of finding the day with the shortest ] duration, for any given position, and its duration.<ref name=source3 /> This problem ''per se'' is not greatly important, yet it shows the geometric genius of Nunes as it was a problem which was independently tackled by ] and ] more than a century later with less success.<ref></ref> They could find a solution to the problem of the ], but failed to determine its duration, possibly because they got lost in the details of ] which, at that time, had only recently been developed. The achievement also shows that Nunes was a pioneer in solving maxima and minima problems, which became a common requirement only in the next century using differential calculus.<ref name=source4></ref> Nunes also solved the problem of finding the day with the shortest ] duration, for any given position, and its duration.<ref name=source3 /> This problem ''per se'' is not greatly important, yet it shows the geometric genius of Nunes as it was a problem which was independently tackled by ] and ] more than a century later with less success.<ref></ref> They could find a solution to the problem of the ], but failed to determine its duration, possibly because they got lost in the details of ] which, at that time, had only recently been developed. The achievement also shows that Nunes was a pioneer in solving maxima and minima problems, which became a common requirement only in the next century using differential calculus.<ref name=source4></ref>


===Cosmology=== ===Cosmology===
He was probably the last major mathematician to make relevant improvements{{According to whom|date=March 2010}} to the ] (a ] describing the relative motion of the Earth and Sun). However, this lost importance because ] introduced his ] theory around the same time. Nunes knew Copernicus' work but referred only briefly to it in his published works, with the purpose of correcting some mathematical errors. He was probably the last major mathematician to make relevant improvements{{According to whom|date=March 2010}} to the ] (a ] describing the relative motion of the Earth and Sun). With time, in a slow and complex process, the geocentric model was replaced by the ] proposed by ]. Nunes knew Copernicus' work but referred only briefly to it in his published works, with the purpose of correcting some mathematical errors.


Most of Nunes' achievements were possible because of his profound understanding of ] and his ability to transpose ]'s adaptations of ] to it. Most of Nunes' achievements were possible because of his profound understanding of ] and his ability to transpose ]'s adaptations of ] to it.


===Inventions=== ===Inventions===
] original model]] ]<ref>Reis, António Estácio dos, "O nónio de Pedro Nunes", Gazeta de matemática, 143 (2002) 5-19</ref>]]
Nunes worked on several practical nautical problems concerning ] as well as attempting to develop more accurate devices to determine a ship's position.<ref name=source4 /> Nunes worked on several practical nautical problems concerning ] as well as attempting to develop more accurate devices to determine a ship's position.<ref name=source4 />


He created the ] to improve the ]'s accuracy. This consisted of a number of ] circles traced on the astrolabe and dividing each successive one with one fewer divisions than the adjacent outer circle. Thus the outermost ] would comprise 90° in 90 equal divisions, the next inner would have 89 divisions, the next 88 and so on. When an angle was measured, the circle and the division on which the ] fell was noted. A table was then consulted to provide the exact measure.{{Citation needed|date=March 2010}} He created the ] to improve instrument (such as the ]) accuracy. This consisted of a number of ] circles traced on the instrument and dividing each successive one with one fewer divisions than the adjacent outer circle. Thus the outermost ] would comprise 90° in 90 equal divisions, the next inner would have 89 divisions, the next 88 and so on. When an angle was measured, the circle and the division on which the ] fell was noted. A table was then consulted to provide the exact measure.{{Citation needed|date=March 2010}}


The nonius was used by ], who considered it too complex. The method inspired improved systems by ] and ].<ref name="daumas">Daumas Maurice, ''Scientific Instruments of the Seventeenth and Eighteenth Centuries and Their Makers'', Portman Books, London 1989 {{ISBN|978-0-7134-0727-3}}</ref> These were eventually improved further by ] in 1631, which reduced the nonius to the ] that includes two scales, one of them fixed and the other movable. Vernier himself used to say that his invention was a perfected nonius and for a long time it was known as the “nonius”, even in France.<ref name=source3 /> In some languages, the Vernier scale is still named after Nunes, for example ''{{lang|sv|nonieskala}}'' in Swedish. The nonius was used by ], who considered it too complex. The method inspired improved systems by ] and ].<ref name="daumas">Daumas Maurice, ''Scientific Instruments of the Seventeenth and Eighteenth Centuries and Their Makers'', Portman Books, London 1989 {{ISBN|978-0-7134-0727-3}}</ref> These were eventually improved further by ] in 1631, which reduced the nonius to the ] that includes two scales, one of them fixed and the other movable. Vernier himself used to say that his invention was a perfected nonius and for a long time it was known as the “nonius”, even in France.<ref name=source3 /> In some languages, the Vernier scale is still named after Nunes, for example ''{{lang|sv|nonieskala}}'' in Swedish.
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==Influence== ==Influence==
Nunes was very influential internationally, e.g. on the work of ] and ].<ref>{{cite web|title=Edward Wright and Pedro Nunes|url=http://pedronunes.fc.ul.pt/episodes/edward_wright/edward_wright.htm|work=Pedro Nunes (1502 - 1578)|publisher=Centre for the History of Sciences, ]|accessdate=17 October 2011|author1=Almeida, Bruno |author2=Leitão, Henrique |lastauthoramp=yes |year=2009}}</ref> Nunes was very influential internationally, e.g. on the work of ]<ref>Almeida, Bruno (September 2012). "On the origins of Dee's mathematical programme: The John Dee–Pedro Nunes connection". Studies in History and Philosophy of Science Part A. 43: 460–469. http://doi:10.1016/j.shpsa.2011.12.004</ref> and ].<ref>{{cite web|title=Edward Wright and Pedro Nunes|url=http://pedronunes.fc.ul.pt/episodes/edward_wright/edward_wright.htm|work=Pedro Nunes (1502 - 1578)|publisher=Centre for the History of Sciences, ]|access-date=17 October 2011|author1=Almeida, Bruno |author2=Leitão, Henrique |name-list-style=amp |year=2009}}</ref>


==Honours== ==Honours==
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*] Airlines has named an ] A330-202 airplane after him, registered CS-TOP. *] Airlines has named an ] A330-202 airplane after him, registered CS-TOP.


== Bibliography == == Works ==
] ]
]
Pedro Nunes translated, commented and expanded some of the major works in his field, and he also published original research. Pedro Nunes translated, commented and expanded some of the major works in his field, and he also published original research.


⚫ Printed work:
Commented and expanded translations:
*''Tratado da sphera com a Theorica do Sol e da Lua'' (Treaty about the Sphere with Theory of the Sun and the Moon), (1537). From '']'' by ], ''Theoricae novae planetarum'' by ] and the ''Geography'' by ]. *''Tratado da sphera com a Theorica do Sol e da Lua'' (Treatise on the Sphere with the theory of the Sun and the Moon), (1537). From '']'' by ], ''Theoricae novæ planetarum'' by ] and the ''Geography'' by ]. Included original texts: ''Tratado em defensam da carta de marear'' (Treatise in defense of the nautical chart), (1537); ''Tratado sobre certas dúvidas da navegação'' (Treatise about some doubts of navigation), (1537)

⚫ Original work:
*''Tratado em defensam da carta de marear'' (Treatise Defending the Sea Chart), (1537).
*''Tratado sobre certas dúvidas da navegação'' (Treatise about some Navigational Doubts), (1537)
*''De crepusculis'' (About the Twilight), (1542). *''De crepusculis'' (About the Twilight), (1542).
* {{Cite book|title=De crepusculis|volume=|publisher=Luiz Rodrigues|location=Lisboa|year=1542|language=la|url=https://gutenberg.beic.it/webclient/DeliveryManager?pid=13148868}}
*''De erratis Orontii Finæi'' (About the Errors of Orontius Finæus), (1546). *''De erratis Orontii Finæi'' (About the errors of ]), (1546).
*''Petri Nonii Salaciensis Opera'', (1566). Expanded, corrected and reedited as ''De arte adque ratione navigandi'' in 1573. *''Petri Nonii Salaciensis Opera'', (1566). Expanded, corrected and reedited as ''De arte adque ratione navigandi'' in 1573.
*''Livro de algebra en arithmetica y geometria'' (Book of Algebra in Arithmetics and Geometry), (1567). *''Livro de algebra en arithmetica y geometria'' (Book of Algebra in Arithmetics and Geometry), (1567).
Manuscripts:

* (Florence manuscript), (written in the period 1537-1540)<ref>{{Cite thesis |title=A influência da obra de Pedro Nunes na náutica dos séculos XVI e XVII:um estudo de transmissão de conhecimento |url=https://repositorio.ul.pt/handle/10451/6699 |date=2011 |degree=doctoralThesis |first=Bruno José M. G. Pereira de |last=Almeida}}</ref>


Some modern reprints: Some modern reprints:
*''Obras'' (4 vol.), Academia das Ciências de Lisboa, Lisboa, 1940-1960 (No ISBN at the at the Portuguese National Library) *''Obras'' (4 vol.), Academia das Ciências de Lisboa, Lisboa, 1940-1960 (No ISBN at the at the Portuguese National Library)
*''Obras'' (6 vol.), ], Lisboa, 2002-2011, {{ISBN|972-31-0985-9}} and {{ISBN|972-31-1084-9}} (more volumes are likely to be published) *''Obras'' (6 vol.), ], Lisboa, 2002–2011, {{ISBN|972-31-0985-9}} and {{ISBN|972-31-1084-9}} (two more volumes are likely to be published)


== Notes == == Notes ==
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] ]
] ]
] ]
⚫ ]
] ]
] ]
]
] ]
] ]
] ]
] ]
] ]
] ]
⚫ ]
]
]
] ]
] ]
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] ]
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Latest revision as of 02:53, 15 November 2024

Portuguese mathematician (1502–1578) For the racing driver, see Pedro Nunes (racing driver).
Pedro Nunes
Pedro Nunes, 1843 print
Born1502
Alcácer do Sal, Portugal
Died11 August 1578 (aged 76)
Coimbra, Portugal
NationalityPortuguese
Occupation(s)Mathematician, cosmographer, and professor
Signature

Pedro Nunes (Portuguese: [ˈpeðɾu ˈnunɨʃ]; Latin: Petrus Nonius; 1502 – 11 August 1578) was a Portuguese mathematician, cosmographer, and professor, probably from a New Christian (of Jewish origin) family.

Considered one of the greatest mathematicians of his time, Nunes is best known for being the first to approach navigation and cartography with mathematical tools. Among other accomplishments, he was the first to propose the idea of a loxodrome (a rhumb line), and was the inventor of several measuring devices, including the nonius (from which the Vernier scale was derived), named after his Latin surname.

Life

Little is known about Nunes' early education, life or family background, only that he was born in Alcácer do Sal in Portugal, his origins are possibly Jewish and that his grandchildren spent a few years behind bars after they were accused by the Portuguese Inquisition of professing and secretly practicing Judaism. He studied at the University of Salamanca, maybe from 1517 until 1522. He returned to Lisbon c. 1529 and started teaching at the University.

He continued his medical studies but held various teaching posts within the University of Lisbon, including Moral, Philosophy, Logic and Metaphysics. He obtained his doctorate in medicine in 1532. When, in 1537, the Portuguese University located in Lisbon returned to Coimbra, he moved to the re-founded University of Coimbra to teach mathematics, a post he held until 1562. This was a new post in the University of Coimbra and it may have been established to provide instruction in the technical requirements for navigation: clearly a topic of great importance in Portugal at this period, when the control of sea trade was the primary source of Portuguese wealth. Mathematics became an independent post in 1544.

In addition to teaching he was appointed Royal Cosmographer in 1529 and Chief Royal Cosmographer in 1547: a post which he held until his death.

In 1531, King John III of Portugal charged Nunes with the education of his younger brothers Luís and Henry. Years later Nunes was also charged with the education of the king's grandson, and future king, Sebastian.

It is possible that, while at the University of Coimbra, future astronomer Christopher Clavius attended Pedro Nunes' classes, and was influenced by his works. Clavius, proponent of the Gregorian Calendar, the greatest figure of the Colégio Romano, the great center of Roman Catholic knowledge of that period, classified Nunes as “supreme mathematical genius". Nunes died in Coimbra.

Work

Pedro Nunes lived in a transition period, during which science was changing from valuing theoretical knowledge (which defined the main role of a scientist/mathematician as commenting on previous authors), to providing experimental data, both as a source of information and as a method of confirming theories. Nunes was, above all, one of the last great commentators, as is shown by his first published work “Tratado da Esfera”, enriched with comments and additions that denote a profound knowledge of the difficult cosmography of the period. He also acknowledged the value of experimentation.

In his Tratado da sphera he argued for a common and universal diffusion of knowledge. Accordingly, he not only published works in Latin, at that time science's lingua franca, aiming for an audience of European scholars, but also in Portuguese, and Spanish (Livro de Algebra).

Navigation

Detail of the Monument to the Portuguese Discoveries showing the well-known navigators. Left to right: Jácome de Maiorca (cosmographer and chart maker), Pedro Escobar (navigator), Pedro Nunes (shown holding an armillary sphere), Pêro de Alenquer (navigator), Gil Eanes (navigator) and finally João Gonçalves Zarco (navigator)

Much of Nunes' work related to navigation. He was the first to understand why a ship maintaining a steady course would not travel along a great circle, the shortest path between two points on Earth, but would instead follow a spiral course, called a loxodrome. These lines —also called rhumb lines— maintain a fixed angle with the meridians. In other words, loxodromic curves are directly related to the construction of the Nunes connection —also called navigator connection.

In his Treaty defending the sea chart, Nunes argued that a nautical chart should have its parallels and meridians shown as straight lines. Yet he was unsure how to solve the problems that this caused: a situation that lasted until Mercator developed the projection bearing his name. The Mercator Projection is the system which is still used.

Geometry

Nunes also solved the problem of finding the day with the shortest twilight duration, for any given position, and its duration. This problem per se is not greatly important, yet it shows the geometric genius of Nunes as it was a problem which was independently tackled by Johann and Jakob Bernoulli more than a century later with less success. They could find a solution to the problem of the shortest day, but failed to determine its duration, possibly because they got lost in the details of differential calculus which, at that time, had only recently been developed. The achievement also shows that Nunes was a pioneer in solving maxima and minima problems, which became a common requirement only in the next century using differential calculus.

Cosmology

He was probably the last major mathematician to make relevant improvements to the ptolemaic system (a geocentric model describing the relative motion of the Earth and Sun). With time, in a slow and complex process, the geocentric model was replaced by the heliocentric system proposed by Nicolaus Copernicus. Nunes knew Copernicus' work but referred only briefly to it in his published works, with the purpose of correcting some mathematical errors.

Most of Nunes' achievements were possible because of his profound understanding of spherical trigonometry and his ability to transpose Ptolemy's adaptations of Euclidean geometry to it.

Inventions

Modern reconstruction of a quadrant with nonius

Nunes worked on several practical nautical problems concerning course correction as well as attempting to develop more accurate devices to determine a ship's position.

He created the nonius to improve instrument (such as the quadrant (instrument)) accuracy. This consisted of a number of concentric circles traced on the instrument and dividing each successive one with one fewer divisions than the adjacent outer circle. Thus the outermost quadrant would comprise 90° in 90 equal divisions, the next inner would have 89 divisions, the next 88 and so on. When an angle was measured, the circle and the division on which the alidade fell was noted. A table was then consulted to provide the exact measure.

The nonius was used by Tycho Brahe, who considered it too complex. The method inspired improved systems by Christopher Clavius and Jacob Curtius. These were eventually improved further by Pierre Vernier in 1631, which reduced the nonius to the Vernier scale that includes two scales, one of them fixed and the other movable. Vernier himself used to say that his invention was a perfected nonius and for a long time it was known as the “nonius”, even in France. In some languages, the Vernier scale is still named after Nunes, for example nonieskala in Swedish.

Pedro Nunes also worked on some mechanics problems, from a mathematical point of view.

Influence

Nunes was very influential internationally, e.g. on the work of John Dee and Edward Wright.

Honours

  • One of the best known Lisbon public Secondary/High Schools is named after Pedro Nunes, Escola Secundária de Pedro Nunes (teaching 7th to 12th grade). It was founded, in 1906, as Lyceu Central da 3ª Zona Escolar de Lisboa (Central Liceum of the 3rd School Area of Lisbon). Over the years had known several designations: Lyceu Central de Pedro Nunes (1911–1930), Liceu Normal de Lisboa (1930–1937), Liceu Pedro Nunes (1937–1956), Liceu Normal de Pedro Nunes (1956–1978) and Escola Secundária de Pedro Nunes (1978–present), but is still popularly known as Liceu Pedro Nunes. Many well known Portuguese personalities have studied in Pedro Nunes. The current headquarters commemorated its centenary in 2011, after being totally refurbished and modernized between 2008 and 2010.
  • He was featured on 100 escudos coins.
  • The Instituto Pedro Nunes in Coimbra, a business incubator and a center of innovation and technology transfer founded by the University of Coimbra, is named after Pedro Nunes.
  • Asteroid 5313 Nunes is named after him
  • TAP Portugal Airlines has named an Airbus A330-202 airplane after him, registered CS-TOP.

Works

De erratis Orontii Finæi, 1546
De arte atque ratione navigandi, 1573

Pedro Nunes translated, commented and expanded some of the major works in his field, and he also published original research.

Printed work:

  • Tratado da sphera com a Theorica do Sol e da Lua (Treatise on the Sphere with the theory of the Sun and the Moon), (1537). From Tractatus de Sphæra by Johannes de Sacrobosco, Theoricae novæ planetarum by Georg Purbach and the Geography by Claudius Ptolemaeus. Included original texts: Tratado em defensam da carta de marear (Treatise in defense of the nautical chart), (1537); Tratado sobre certas dúvidas da navegação (Treatise about some doubts of navigation), (1537)
  • De crepusculis (About the Twilight), (1542).
  • De crepusculis (in Latin). Lisboa: Luiz Rodrigues. 1542.
  • De erratis Orontii Finæi (About the errors of Oronce Fine), (1546).
  • Petri Nonii Salaciensis Opera, (1566). Expanded, corrected and reedited as De arte adque ratione navigandi in 1573.
  • Livro de algebra en arithmetica y geometria (Book of Algebra in Arithmetics and Geometry), (1567).

Manuscripts:

  • (Florence manuscript), (written in the period 1537-1540)

Some modern reprints:

Notes

  1. "The Galileo Project".
  2. Martins, Jorge, Portugal e os Judeus (3 vol.), Nova Vega, Lisboa, 2006, ISBN 972-699-847-6
  3. ^ Leitão, Henrique, "Para uma biografia de Pedro Nunes: O surgimento de um matemático, 1502-1542", Cadernos de Estudos Sefarditas, 3 (2003) 45-82.
  4. J J O'Connor (November 2010). "Pedro Nunes Salaciense". Retrieved 2015-11-20.
  5. Pedro Nunes (1502-1578)
  6. ^ O'Connor, J. J.; Robertson, E. F. (November 2010). "Biography of Pedro Nunes Salaciense". School of Mathematics and Statistics, University of St Andrews, Scotland. Retrieved 2014-04-08.
  7. ^ Pedro Nunes – A mathematician in a country of navigators
  8. "Pedro Nunes (1502-1578)". www-groups.dcs.st-and.ac.uk. Retrieved 2019-02-08.
  9. Fernández, V.V.; Rodrigues Jr., W.A. (2010), Gravitation as a Plastic Distortion of the Lorentz Vacuum, Berlin Heidelberg: Springer-Verlag, p. 5, arXiv:0909.4472, Bibcode:2010gpdl.book.....F, doi:10.1007/978-3-642-13589-7, ISBN 978-3-642-13589-7, S2CID 115171595
  10. «o bem, quanto mais comum e universal, tanto é mais excelente» quoted by Calafate, Pedro (see above)
  11. In mathematics, Nunes connection is an example of connection which Cartan showed to Einstein in 1922 when he visited Paris.
  12. Prelúdio para uma história: ciência e tecnologia no Brasil
  13. ^ Pedro Nunes (1502 - 1578)(Science)
  14. Reis, António Estácio dos, "O nónio de Pedro Nunes", Gazeta de matemática, 143 (2002) 5-19
  15. Daumas Maurice, Scientific Instruments of the Seventeenth and Eighteenth Centuries and Their Makers, Portman Books, London 1989 ISBN 978-0-7134-0727-3
  16. Almeida, Bruno (September 2012). "On the origins of Dee's mathematical programme: The John Dee–Pedro Nunes connection". Studies in History and Philosophy of Science Part A. 43: 460–469. http://doi:10.1016/j.shpsa.2011.12.004
  17. Almeida, Bruno & Leitão, Henrique (2009). "Edward Wright and Pedro Nunes". Pedro Nunes (1502 - 1578). Centre for the History of Sciences, Lisbon University. Retrieved 17 October 2011.
  18. Almeida, Bruno José M. G. Pereira de (2011). A influência da obra de Pedro Nunes na náutica dos séculos XVI e XVII:um estudo de transmissão de conhecimento (doctoralThesis thesis).

References

External links

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