chronometer

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Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

Calendar marking march 15th

22 Questions About Time and Timekeeping Answered

Abstract vector hi speed internet technology background

History of Technology Timeline

molecule model, element

Molecular Machines: Making for the Future

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

15 Questions About Units of Measurement Answered

Discover

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

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

Black widow spider

9 of the World’s Deadliest Spiders

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

Poker game. Card game. Royal Flush in poker. Hearts suit gambling

Poker Hands Ranked

earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

The 6 Deadliest Earthquakes Since 1950

cloning. First cloned cat. First cloned companion animal. CC (copy cat) female domestic shorthair cat (b. Dec. 22, 2001) photo Jan. 18, 2002. Cloned at Texas A&M Univ. College of Vet. Med. & Biomedical Sciences. Reproductive cloning genetics DNA cc cat

CC, The First Cloned Cat

chronometer: Related Content

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

Topics

ship’s bell time clock machine calendar sundial chronograph gnomon clepsydra hourglass particle accelerator robot lubrication simple machine

Dig Deeper: More Articles That Discuss This Topic

Key People

Edward John Dent

British clockmaker

John Harrison, detail of an oil painting by Thomas King; in the Science Museum, London

John Harrison

British horologist

Ferdinand Berthoud

French horologist

Thomas Earnshaw

English watchmaker

Quiz

Clock face of Big Ben.

Scientists and Their Inventions Quiz

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

Fun Facts of Measurement & Math