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Willem de Sitter
Table of Contents
Introduction References & Edit History Quick Facts & Related Topics
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
Related Questions
Read Next
Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)
How Fast Is the Universe Expanding?
Planet Earth and lunar moon from space
Where Did the Moon Come From?
solar eclipse, sun, moon, astronomy, space
How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?
Arrangement of the phases of the moon in total eclipse with Blood Moon
9 Celestial Omens
bunch of numbers
Unusual Counting Systems
Discover
African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
Timeline of the American Civil Rights Movement
Calendar marking march 15th
22 Questions About Time and Timekeeping Answered
Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium
When Was the Periodic Table Invented?
Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile
6 Lost Civilizations
Franklin D. Roosevelt, who formulated the Four Freedoms.
7 Alphabet Soup Agencies that Stuck Around
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
11 Egyptian Gods and Goddesses

Willem de Sitter: Facts & Related Content

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Facts

Born May 6, 1872 • Sneek • Netherlands
Died November 20, 1934 (aged 62) • Leiden • Netherlands
Subjects Of Study expanding universe
Christiaan Huygens
Christiaan Huygens
Dutch scientist and mathematician
Willebrord Snell
Dutch astronomer and mathematician
Galileo
Galileo
Italian philosopher, astronomer and mathematician
Giordano Bruno
Giordano Bruno
Italian philosopher
Hipparchus
Greek astronomer
Carl Friedrich Gauss
Carl Friedrich Gauss
German mathematician
How did Ptolemy explain retrograde motion?
Ptolemy
Egyptian astronomer, mathematician, and geographer
Edmond Halley
Edmond Halley
British scientist
Edwin Hubble
Edwin Hubble
American astronomer
Sir William Rowan Hamilton
Irish mathematician and astronomer
Arthur Stanley Eddington.
Arthur Eddington
British scientist
Laplace, Pierre-Simon, marquis de
Pierre-Simon, marquis de Laplace
French scientist and mathematician
John Herschel
Sir John Herschel, 1st Baronet
English astronomer
Eudoxus of Cnidus
Greek mathematician and astronomer
Simon Newcomb, c. 1905.
Simon Newcomb
American astronomer and mathematician
Omar Khayyam
Persian poet and astronomer
Ibn al-Haytham
Arab astronomer and mathematician
al-Kāshī
Persian astronomer and mathematician
Regiomontanus
German mathematician
Kidinnu
Babylonian astronomer and mathematician

Related Quizzes and Features

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
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz