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time
Table of Contents
References & Edit History Related Topics
Images & Videos
Alfred North Whitehead St. Augustine Ajanta Caves: reclining Buddha Plato Charles Darwin Isaac Newton
relativity of simultaneity
David Hume
Listen to physicist Sean Carroll explaining the connection between entropy and the second law of thermodynamics
How do atomic clocks work?
For Students
Alfred North Whitehead
time summary
Quizzes
Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
Physics and Natural Law
Italian physicist Guglielmo Marconi at work in the wireless room of his yacht Electra, c. 1920.
All About Physics Quiz
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Calendar marking march 15th
22 Questions About Time and Timekeeping Answered
Moonrise over Tucson, Arizona
Why Doesn’t Arizona Observe Daylight Saving Time?
Discover
New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.
Why Is It Called Black Friday?
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Super Typhoon Noru over the western tropical Pacific Ocean as observed by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA Aqua satellite July 31 2017
What Is the Difference Between a Typhoon and a Super Typhoon?
A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
14 Tough Questions Answered
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
Thanksgiving Celebration Traditional Dinner Setting Food Concept
Why Is Thanksgiving in the U.S. Celebrated on a Thursday?
Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that
America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)

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Videos

relativity of simultaneity
Brian Greene derives the time discrepancy between two people who are moving relative...
Video: © World Science Festival (A Britannica Publishing Partner)
Listen to physicist Sean Carroll explaining the connection between entropy and the second law of thermodynamics
Physicist Sean Carroll explaining how the arrow of time is not an intrinsic property...
Video: © MinutePhysics (A Britannica Publishing Partner)
How do atomic clocks work?
Overview of clocks, with a focus on atomic clocks.
Video: Contunico © ZDF Studios GmbH, Mainz
Martian year
Learn how long a year is on Mars.
Video: JPL/NASA
Explore three simple ways and three complicated ways of time traveling
Learn about three simple ways (do nothing, walk, and stand up) and three complicated...
Video: © MinutePhysics (A Britannica Publishing Partner)

Images

Alfred North Whitehead
Alfred North Whitehead.
St. Augustine
St. Augustine, fresco by Sandro Botticelli, 1480; in the Church of Ognissanti, Florence.
Alinari/Art Resource, New York
Ajanta Caves: reclining Buddha
Reclining Buddha statue, Ajanta Caves, north-central Maharashtra state, India.
© davidevison/stock.adobe.com
Plato
Marble portrait bust of Plato, from an original of the 4th century bce;...
© DeAgostini/SuperStock
Charles Darwin
Charles Darwin, 1881.
Hulton Archive/Getty Images
Isaac Newton
Isaac Newton.
© duncan1890— DigitalVision Vectors/Getty Images
David Hume
David Hume, oil on canvas by Allan Ramsay, 1766; in the Scottish National Portrait...
Fine Art Images—Heritage Images/age fotostock
VIEW MORE in these related Britannica articles: