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(Aeon.co)   How they decided just how long a second should be   (aeon.co) divider line
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681 clicks; posted to STEM » on 09 Feb 2021 at 7:06 PM (12 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



11 Comments     (+0 »)
View Voting Results: Smartest and Funniest
 
2021-02-09 6:49:24 PM  
TLDR. Time is subjective.

/ as you approach the speed of light, (theoretically) the time you experience is less than the time that actually passes.
 
2021-02-09 7:14:19 PM  

iheartscotch: TLDR. Time is subjective.

/ as you approach the speed of light, (theoretically) the time you experience is less than the time that actually passes.


It's not theoretical at all.  Satalites lose ticks because of relativity.  If that wasn't accounted for, GPS would be useless.


Pokemon Go depends on relativity and I'm not sure how to feel about that.
 
2021-02-09 7:28:19 PM  
"A man with a watch knows what time it is. A man with two watches is never sure."
 
2021-02-09 11:26:24 PM  
oh this looks interesting
*Clicks links*
Oh it is a video
*closes tab*
Guess I will never know since people forgot how to write
¯\_(ツ)_/¯
 
2021-02-09 11:31:25 PM  
I bet subby's dad had something to do with it
 
2021-02-10 1:30:45 AM  

kkinnison: oh this looks interesting
*Clicks links*
Oh it is a video
*closes tab*
Guess I will never know since people forgot how to write
¯\_(ツ)_/¯


It's an overview of CGPM's decision on cesium 133 use in atomic clocks. You didn't miss anything.
 
2021-02-10 2:17:46 AM  
TLDW. Something something caesium something (if I had to guess).

Seems like we should really call them firsts.
 
2021-02-10 3:55:02 AM  
They measured two seconds and divided in half. That way it's twice as accurate as just measuring one second with the same observational error.
 
2021-02-10 8:44:47 AM  
It's simple: a scientist asked their spouse how long till they're ready, the spouse answered one second, the scientist measured that.
 
2021-02-10 9:23:58 AM  
I was really hoping for a history lesson on how it was decided a second was 1/60 of a minute and so on. Not a lesson fit for children on atomic clocks. I wonder where I'll end up on the other side of the rabbit hole when I venture out to learn what I wanted to.
 
2021-02-10 9:25:23 AM  
A second should last just long enough to go from the previous second to the next one.
 
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