Trigonometry

to simplify the calculation of distances between two points on the surface of the earth using spherical trigonometry

Bürgi was able to calculate sines at arbitrary precision

He did important early work on trigonometry.

De triangulis omnimodis was one of the first textbooks presenting the current state of trigonometry

van Roomen (29 September 1561-4 May 1615), also known as Adrianus Romanus, was a mathematician, professor of medicine and medical astrologer from the Duchy of Brabant in the Habsburg Netherlands who was active throughout Central Europe in the late

Clavius, (25 March 1538-6 February 1612) was a Jesuit German mathematician and physicist, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed calendar invented by

also shows Van Ceulen to be as expert in trigonometry as his contemporary Viète

He studied in Prague and Vienna, and subsequently succeeded his tutor, Christopher Clavius, as professor of mathematics at the Collegio Romano in 1612.

he described various measures to calculate sines

He also worked on the geometry of the sphere and applications of trigonometry

Georg Joachim de Porris, also known as Rheticus (; 16 February 1514-4 December 1574), was a mathematician, astronomer, cartographer, navigational-instrument maker, medical practitioner, and teacher.

Girard worked on algebra, trigonometry and arithmetic.

Wright (baptised 8 October 1561; died November 1615) was an English mathematician and cartographer noted for his book Certaine Errors in Navigation (1599; 2nd ed., 1610), which for the first time explained the mathematical basis of the Mercator

Wittich found how to replace multiplication and division with addition and subtraction using the rules for sines and cosines of the sums and differences of angles

Jyeṣṭhadeva (Malayalam: ജ്യേഷ്ഠദേവൻ; c. 1500, c. 1575) was an astronomer-mathematician of the Kerala school of astronomy and mathematics founded by Madhava of Sangamagrama (c. 1350, c. 1425).

Thomas Fincke (6 January 1561-24 April 1656) was a Danish mathematician and physicist, and a professor at the University of Copenhagen for more than 60 years. == Biography == Thomas Jacobsen Fincke was born in Flensburg in Schleswig.

(also Valentin Otto; born around 1545-46 possibly in Magdeburg, 8 April 1603 in Heidelberg) was a German mathematician and astronomer. == Life == In 1573 he came to Wittenberg, proposing to Johannes Praetorius an approximation of pi as π≈355113 (now

William Oughtred ( AWT-urd;5 March 1574-30 June 1660), also Owtred or Uhtred, was an English mathematician and Anglican clergyman.

Willebrord Snellius (born Willebrord Snel van Royen, also Willebrord van Roijen Snel (13 June 1580-30 October 1626), commonly known simply as Snellius and Snel, was a Dutch astronomer and mathematician.

Edmund Gunter (1581-10 December 1626), was an English clergyman, mathematician, geometer and astronomer of Welsh descent.

Morin (February 23, 1583, November 6, 1656), also known by the Latinized name as Morinus, was a French mathematician, astrologer, and astronomer. == Life and work == Born in Villefranche-sur-Saône, in the Lyonnais, he began studying philosophy at

Henry Gellibrand (1597-1637) was an English mathematician.

classical scholar Samuel Pitiscus (1637-1727) was his nephew. == Mathematics == Pitiscus achieved fame with his influential work, Trigonometria: sive de solutione triangulorum tractatus brevis et perspicuus (Trigonometry: A short and clear treatise on the

John Wallis received from Foster a theorem on spherical triangles

Sir Jonas Moore first used the abbreviated notation 'cos' for the trigonometric term cosine

Caswell's publications included a book on trigonometry in 1685.

His publications covered topics on mathematics and astronomy, including sundials, spherical trigonometry, and celestial maps and globes.

contributed to spherical trigonometry

Traité de trigonométrie rectiligne et sphérique

Traité de la Trigonométric pour resoudre tous Triangles rectilignes et sphériques

exceptional contribution to trigonometry

He described an early practical design for the reflecting telescope, the Gregorian telescope, and made advances in trigonometry, discovering infinite series representations for several trigonometric functions.

Jan Jansz de Jonge Stampioen (1610, Rotterdam - 1653, The Hague) was a Dutch mathematician famous for his published work on spherical trigonometry.

From 1701 and until his death, he taught arithmetic, geometry and trigonometry at the Moscow School of Mathematics and Navigation, becoming its director in 1716.

Trigonometriae Planae & Sphaericae Elementa.

Trigonometrische Calculation, der Anno Christi 1724. den 22 Maji ... vorfallenden grossen Sonnen-Finsterniss : wie dieselbe über den Hamburgischen Horizont sich praesentiren wird ... auffgesetzet von Nicolaus Rohlfs.

Important in navigation, it is a special case of a more general formula in spherical trigonometry, the law of haversines, that relates the sides and angles of spherical triangles.

The formula is important because it connects complex numbers and trigonometry.

Geometry Trigonometry

The Pythagorean trigonometric identity, also called simply the Pythagorean

The differentiation of trigonometric functions is the mathematical process of finding

Hipparchus was a Greek mathematician who compiled an early example of trigonometric tables and gave methods for solving spherical triangles.