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James Gregory
Introduction References & Edit History Quick Facts & Related Topics
Images
James Gregory. Diagram of a Gregorian telescope showing light entering the tube, reflecting off a primary parabolic mirror, then a secondary concave mirror, and focusing at the eyepiece.
Quizzes
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
Michael Faraday (L) English physicist and chemist (electromagnetism) and John Frederic Daniell (R) British chemist and meteorologist who invented the Daniell cell.
Faces of Science
Equations written on blackboard
Numbers and Mathematics
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy

James Gregory: References & Edit History

Article Contributors

Primary Contributors

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Anniversary information added. Oct 28, 2025
Anniversary information added. Sep 27, 2025
First paragraph modernization. Mar 08, 2024
Invalidated site: MacTutor History of Mathematics Archive - Biography of James Gregory. Sep 24, 2021
Add new Web site: Molecular Expressions - James Gregory. Apr 03, 2020
Changed the birth date of Archimedes from c. 285 to 287 BCE. Oct 12, 2017
Media added. Feb 26, 2009
Added new Web site: MacTutor History of Mathematics Archive - Biography of James Gregory.
  • Gaurav Shukla
 Nov 23, 2006
Article revised. Feb 16, 2001
Article added to new online database. Jul 20, 1998
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