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year
Table of Contents
Introduction References & Edit History Related Topics
Images & Videos
calendar of Gregory XIII from January to June
Study the different ways of defining a year - a tropical year, a sidereal year, and the anomalistic year
What is Leap Day?
Martian year
Discover the length of days and years on Mercury
Quizzes
barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure
Fun Facts of Measurement & Math
Related Questions
Read Next
Ancient Mayan Calendar
Our Days Are Numbered: 7 Crazy Facts About Calendars
Flower. Fruit tree. Cherry. Cherry tree. Cherry blossom. Spring. Close-up of cherry blossoms in bloom.
The Perils of an Early Spring
February 29, leap day, leap year, happens every four years
Leap Day, February 29
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?
Calendar marking march 15th
22 Questions About Time and Timekeeping Answered
Discover
Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
10 Greatest Baseball Players of All Time
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?
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)
Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint
8 of the Largest Empires in History
Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway
Flags That Look Alike
Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.
Where Do Anti-Semitic Conspiracy Theories About the Rothschild Family Come From?

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Videos

Study the different ways of defining a year - a tropical year, a sidereal year, and the anomalistic year
Learn about the different definitions of a year: a tropical year, a sidereal year,...
Video: © MinutePhysics (A Britannica Publishing Partner)
What is Leap Day?
An extra day is added to the calendar about every four years. Why?
Video: Encyclopædia Britannica, Inc.
Martian year
Learn how long a year is on Mars.
Video: JPL/NASA
Discover the length of days and years on Mercury
Learn about the length of both a year and a day on Mercury.
Video: © Open University (A Britannica Publishing Partner)

Images

calendar of Gregory XIII from January to June
Gregorian calendar from Elementos de Matematica by the Spanish architect...
© PHAS/Universal Images Group/Getty Images
VIEW MORE in these related Britannica articles: