Why 60 Seconds, 60 Minutes But 24 Hours?

#Science

Wed, Jul 27th, 2011 20:00 by capnasty NEWS

Scientific American looks as to why a minute has 60 seconds, an hour 60 minutes, but a day only has 24 hours.

From the article:

Thanks to the ancient civilizations that defined and preserved the divisions of time, modern society still conceives of a day of 24 hours, an hour of 60 minutes and a minute of 60 seconds. Advances in the science of timekeeping, however, have changed how these units are defined. Seconds were once derived by dividing astronomical events into smaller parts, with the International System of Units (SI) at one time defining the second as a fraction of the mean solar day and later relating it to the tropical year. This changed in 1967, when the second was redefined as the duration of 9,192,631,770 energy transitions of the cesium atom. This recharacterization ushered in the era of atomic timekeeping and Coordinated Universal Time (UTC).

  1228

 

You may also be interested in:

No Bugs in Chernobyl
"Creating an HIV vaccine is like trying to fire a gun at millions of shielded, moving targets that can eat your bullets." Why We Have No Cure for AIDS
Scientists Discover Cockatoos Can Crack Locks
Junk alert for space station crew
TED Pop-Up Presentation Explains Pangaea