# Speed of time

**URL:** <https://boards.straightdope.com/t/speed-of-time/171303>\
**Category:** Great Debates\
**Created:** [April 26, 2003, 12:23pm UTC](https://boards.straightdope.com/t/speed-of-time/171303 "2003-04-26T12:23:16Z")\
**Posts on this page:** 1\
**Page:** 3

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**Author:** ![SentientMeat](https://avatars.discourse-cdn.com/v4/letter/s/43a26b/32.png) [@SentientMeat](https://boards.straightdope.com/u/SentientMeat)\
**Post date:** [May 1, 2003, 1:15pm UTC](https://boards.straightdope.com/t/speed-of-time/171303/41 "2003-05-01T13:15:38Z")

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> [@](#):
>
> So what measure of time is used?

[You count the peaks of a sinewave coming from a certain energy level of a caesium atom.](http://www.physlink.com/Education/AskExperts/ae297.cfm) One second is defined as 9,192,631,770 cycles.

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