smoot

What’s a Second?

jtotheizzoe:

Random fact for today:

As a unit of time, a second used to be defined as

• 1/31,556,925.9747 of the length of the year 1900 at January 0

But is now defined as

• “the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom”

So there ya go. It looks like this:

via jtotheizzoe

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