Celebrating 19 Years on the Web
TODAY IN SCIENCE HISTORY ®
Find science on or your birthday

Today in Science History - Quickie Quiz
Who said: “As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.”
more quiz questions >>
Home > Dictionary of Science Quotations > Scientist Names Index E > Eratosthenes Quotes

Eratosthenes
(c. 276 B.C. - c. 196 B.C.)

Greek astronomer.

Science Quotes by Eratosthenes (4 quotes)

Eratosthenes declares that it is no longer necessary to inquire as to the cause of the overflow of the Nile, since we know definitely that men have come to the sources of the Nile and have observed the rains there.
— Eratosthenes
Proclus on Plato Timaeus, Vol. 1, 121.8-11 (Diehl). Quoted in Morris R. Cohen and I. E. Drabkin, A Sourcebook in Greek Science (1948), 383.
Science quotes on:  |  Cause (541)  |  Declare (45)  |  Flood (50)  |  Inquire (23)  |  Know (1518)  |  Necessary (363)  |  Observation (555)  |  Observed (149)  |  Overflow (9)  |  Rain (62)  |  River (119)

In comparison with the great size of the earth the protrusion of mountains is not sufficient to deprive it of its spherical shape or to invalidate measurements based on its spherical shape. For Eratosthenes shows that the perpendicular distance from the highest mountain tops to the lowest regions is ten stades [c.5,000-5,500 feet]. This he shows with the help of dioptras which measure magnitudes at a distance.
— Eratosthenes
Simplicius, Commentary On Aristotle's De Caelo, pp. 549.32-550.4 (Heiberg). Quoted in Morris R. Cohen and I. E. Drabkin, A Sourcebook in Greek Science (1948), 160 n.2.
Science quotes on:  |  Comparison (102)  |  Distance (161)  |  Earth (996)  |  Great (1574)  |  Magnitude (83)  |  Measure (232)  |  Measurement (174)  |  Mountain (185)  |  Show (346)  |  Sufficient (128)  |  Top (96)

The method of producing these numbers is called a sieve by Eratosthenes, since we take the odd numbers mingled and indiscriminate and we separate out of them by this method of production, as if by some instrument or sieve, the prime and incomposite numbers by themselves, and the secondary and composite numbers by themselves, and we find separately those that are mixed.
— Eratosthenes
Nicomachus, Introduction to Arithmetic, 1.13.2. Quoted in Morris R. Cohen and I. E. Drabkin, A Sourcebook in Greek Science (1948), 19-20.
Science quotes on:  |  Arithmetic (136)  |  Call (769)  |  Find (998)  |  Instrument (144)  |  Method (505)  |  Number (699)  |  Production (183)  |  Separate (143)  |  Themselves (433)

[Eratosthenes] ... is a mathematician among geographers, and yet a geographer among mathematicians; and consequently on both sides he offers his opponents occasions for contradiction.
— Eratosthenes
H. L. Jones (ed.), The Geography of Strabo (1917), Vol. 1, 359-61.
Science quotes on:  |  Both (493)  |  Contradiction (68)  |  Geographer (6)  |  Mathematician (387)  |  Occasion (85)  |  Offer (141)  |  Opponent (19)  |  Side (233)



Quotes by others about Eratosthenes (1)

Eratosthenes of Cyrene, employing mathematical theories and geometrical methods, discovered from the course of the sun, the shadows cast by an equinoctial gnomon, and the inclination of the heaven that the circumference of the earth is two hundred and fifty-two thousand stadia, that is, thirty-one million five hundred thousand paces.
Vitruvius
In De Architectura, Book 1, Chap 6, Sec. 9. As translated in Morris Hicky Morgan (trans.), Vitruvius: The Ten Books on Architecture (1914), 27-28.
Science quotes on:  |  Cast (66)  |  Circumference (23)  |  Course (409)  |  Discover (553)  |  Earth (996)  |  Geometry (255)  |  Heaven (258)  |  Hundred (229)  |  Inclination (34)  |  Mathematics (1328)  |  Method (505)  |  Methods (204)  |  Pace (14)  |  Shadow (72)  |  Sun (385)  |  Thousand (331)  |  Two (937)


Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
Quotations by: Albert Einstein Isaac Newton Lord Kelvin Charles Darwin Srinivasa Ramanujan Carl Sagan Florence Nightingale Thomas Edison Aristotle Marie Curie Benjamin Franklin Winston Churchill Galileo Galilei Sigmund Freud Robert Bunsen Louis Pasteur Theodore Roosevelt Abraham Lincoln Ronald Reagan Leonardo DaVinci Michio Kaku Karl Popper Johann Goethe Robert Oppenheimer Charles Kettering  ... (more people)

Quotations about: Atomic  Bomb Biology Chemistry Deforestation Engineering Anatomy Astronomy Bacteria Biochemistry Botany Conservation Dinosaur Environment Fractal Genetics Geology History of Science Invention Jupiter Knowledge Love Mathematics Measurement Medicine Natural Resource Organic Chemistry Physics Physician Quantum Theory Research Science and Art Teacher Technology Universe Volcano Virus Wind Power Women Scientists X-Rays Youth Zoology  ... (more topics)
Sitewide search within all Today In Science History pages:
Visit our Science and Scientist Quotations index for more Science Quotes from archaeologists, biologists, chemists, geologists, inventors and inventions, mathematicians, physicists, pioneers in medicine, science events and technology.

Names index: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Categories index: | 1 | 2 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

- 100 -
Sophie Germain
Gertrude Elion
Ernest Rutherford
James Chadwick
Marcel Proust
William Harvey
Johann Goethe
John Keynes
Carl Gauss
Paul Feyerabend
- 90 -
Antoine Lavoisier
Lise Meitner
Charles Babbage
Ibn Khaldun
Euclid
Ralph Emerson
Robert Bunsen
Frederick Banting
Andre Ampere
Winston Churchill
- 80 -
John Locke
Bronislaw Malinowski
Bible
Thomas Huxley
Alessandro Volta
Erwin Schrodinger
Wilhelm Roentgen
Louis Pasteur
Bertrand Russell
Jean Lamarck
- 70 -
Samuel Morse
John Wheeler
Nicolaus Copernicus
Robert Fulton
Pierre Laplace
Humphry Davy
Thomas Edison
Lord Kelvin
Theodore Roosevelt
Carolus Linnaeus
- 60 -
Francis Galton
Linus Pauling
Immanuel Kant
Martin Fischer
Robert Boyle
Karl Popper
Paul Dirac
Avicenna
James Watson
William Shakespeare
- 50 -
Stephen Hawking
Niels Bohr
Nikola Tesla
Rachel Carson
Max Planck
Henry Adams
Richard Dawkins
Werner Heisenberg
Alfred Wegener
John Dalton
- 40 -
Pierre Fermat
Edward Wilson
Johannes Kepler
Gustave Eiffel
Giordano Bruno
JJ Thomson
Thomas Kuhn
Leonardo DaVinci
Archimedes
David Hume
- 30 -
Andreas Vesalius
Rudolf Virchow
Richard Feynman
James Hutton
Alexander Fleming
Emile Durkheim
Benjamin Franklin
Robert Oppenheimer
Robert Hooke
Charles Kettering
- 20 -
Carl Sagan
James Maxwell
Marie Curie
Rene Descartes
Francis Crick
Hippocrates
Michael Faraday
Srinivasa Ramanujan
Francis Bacon
Galileo Galilei
- 10 -
Aristotle
John Watson
Rosalind Franklin
Michio Kaku
Isaac Asimov
Charles Darwin
Sigmund Freud
Albert Einstein
Florence Nightingale
Isaac Newton



who invites your feedback
Thank you for sharing.
Today in Science History
Sign up for Newsletter
with quiz, quotes and more.