atomic time

Table of Contents

Introduction References & Edit History Quick Facts & Related Topics

Images & Videos

Daylight Saving Time?

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Highway Night Traffic Portland, drive, driving, car, automobile.

What's the Difference Between Speed and Velocity?

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

Calendar marking march 15th

22 Questions About Time and Timekeeping Answered

Above the clouds 130 nautical miles below, astronaut Mark C. Lee floats freely without tethers as he tests the new Simplified Aid for Extravehicular Activity (EVA) Spacewalk Rescue (SAFER) system, Sept. 16, 1994. Space Shuttle Discovery, STS-64

Gravity: From Apples to the Universe

Centimetres vs inches, metal rulers on a white background with clipping path.

15 Questions About Units of Measurement Answered

Discover

Titanic infographic. The 30th anniversary of its discovery is September 1, 2015. SPOTLIGHT VERSION.

Timeline of the Titanic’s Final Hours

Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

Easter Procession of Maria Santisima del Sacromonte in Granada, Spain. This statue is known as Virgen de los Gitanos or The Virgin of the Gypsies.

What is Holy Week?

Hemp (Cannabis sativa).

9 Mind-Altering Plants

Cheetah (Acinonyx jubatus) standing on rock, side view, Masai Mara National Reserve, Kenya

The Fastest Animals on Earth

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

atomic time: Media

physics

Videos

Daylight Saving Time?

Daylight Saving Time?

What's the point of Daylight Saving Time?

Video: Encyclopædia Britannica, Inc.

Images

Atomic time

NIST-F1 cesium fountain atomic clock, the primary time and frequency standard for...

National Institute of Standards and Technology (NIST)

VIEW MORE in these related Britannica articles: