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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

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

Calendar marking march 15th

22 Questions About Time and Timekeeping Answered

Ancient Mayan Calendar

Our Days Are Numbered: 7 Crazy Facts About Calendars

Discover

A tornado in rural Iowa sweeps dangerously near a farm. Weather storm

Why Does the United States Have More Tornadoes than Any Other Country?

Malayan Leaf Frog - Megophrys nasuta

9 Animals That Look Like Leaves

Washington, D.C. locator map.

What State Is Washington, D.C. In?

jeans, denim, pants, clothing

Why Do We Say “A Pair of Pants”?

President Barack Obama signs the White House Initiative on Educational Excellence for African Americans Executive Order in the Oval Office, July 26, 2012

What Is an Executive Order?

Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963

Was Martin Luther King, Jr., a Republican or a Democrat?

Flag of Bhutan

6 Small Kingdoms of the World

week: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

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day calendar time month unit second hour minute Metonic cycle time perception clock sundial metric system astronomical unit dynamical time

Quiz

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

Fun Facts of Measurement & Math