Geodesy

Hellenistic scholar and head of the Library of Alexandria who measured the circumference of the Earth, drew a gridded world map, founded scientific chronology and gave his name to the prime-number sieve.

geography, geodesy, number theory

Khwarazmian polymath who measured the Earth's radius from a hilltop, determined longitudes from eclipse timings, systematized trigonometry for astronomy in the Mas'udic Canon, and wrote the classic medieval study of India.

astronomy, trigonometry, geodesy

Observational astronomer who discovered four moons of Saturn and the Cassini division, measured planetary rotation and the solar parallax, and founded a dynasty that directed the Paris Observatory.

astronomy, planetary science, geodesy

French mathematician and philosopher who led the Lapland expedition that showed the Earth is oblate, proposed the principle of least action, and presided over the Berlin Academy.

geodesy, mechanics, variational principles

Leading French Newtonian who derived the figure of the Earth from hydrostatics, resolved the motion of the lunar apogee and predicted the 1759 return of Halley's comet.

geodesy, celestial mechanics, differential geometry

French analyst who introduced Legendre polynomials, the Legendre transformation and symbol, stated quadratic reciprocity, first published least squares, and founded the theory of elliptic integrals.

number theory, elliptic integrals, calculus of variations

French physicist who co-discovered the Biot–Savart law, founded polarimetry through the laws of optical rotation, and established the extraterrestrial origin of meteorites.

electromagnetism, optics, polarimetry

Founder of modern number theory and the intrinsic geometry of surfaces, and author of least squares, the normal law and Gauss's law.

number theory, algebra, differential geometry

Founder of precision astrometry who measured the first stellar parallax and systematized the functions that bear his name.

astronomy, astrometry, geodesy

Astronomer and physicist who discovered chromatic polarization and magnetism of rotation, championed Fresnel's wave theory, led the Académie des sciences and abolished slavery in the French colonies as minister in 1848.

astronomy, optics, electromagnetism

Astronomer Royal for 46 years who fixed the Greenwich meridian and gave his name to the Airy disk, the Airy function, Airy isostasy and the Airy stress function.

astronomy, optics, geodesy

American logician, scientist and philosopher who developed the logic of relations and quantifiers, existential graphs, the theory of signs and pragmatism, while measuring gravity for the U.S. Coast Survey.

logic, semiotics, philosophy of science