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eridani

(51,907 posts)
Thu Oct 17, 2013, 05:23 AM Oct 2013

With Earth spinning more slowly, time isn't flying as fast as before

AS the old saw goes--time is Nature's way of keeping everything from happening all at once.

http://www.smh.com.au/technology/sci-tech/with-earth-spinning-more-slowly-time-isnt-flying-as-fast-as-before-20130925-2udsk.html#ixzz2hy1SsfHE

Don't forget to set your clocks ahead two thousandths of a second before you go to sleep tonight. Same thing goes for bedtime tomorrow. And every day after that, because that is how much slower the Earth turns on its axis each day now than it did a century ago.

All of those sub-eyeblink slowdowns each century have been adding up, too. For Jurassic-era stegosauruses 200 million years ago, the day was perhaps 23 hours long and each year had about 385 days. Two hundred million years from now, the daily dramas for whatever we evolve into will unfold during 25-hour days and 335-day years.

"We naively think there always has been 24 hours per day," says Thomas O'Brian, chief of the Time and Frequency Division of the National Institute of Standards and Technology (NIST). "But that is not the case."

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With Earth spinning more slowly, time isn't flying as fast as before (Original Post) eridani Oct 2013 OP
"So this means the Earth is only 5,000 years old oh08dem Oct 2013 #1
Thanks, eridani. Just adore geeky science stuff! Surya Gayatri Oct 2013 #2
And here I thought NIST only had one bit of strange news for us TxDemChem Oct 2013 #3
I thought my time loss was due Ichingcarpenter Oct 2013 #4
Oh great, one MORE thing to worry about... FailureToCommunicate Oct 2013 #5
Ignorant "science" writers have no sense of scale. The "two 1000th sec per day" is obviously wrong. Bernardo de La Paz Oct 2013 #6
Recommended to bring attention to your post - as you note, 18 microseconds/year.... xocet Oct 2013 #7

oh08dem

(339 posts)
1. "So this means the Earth is only 5,000 years old
Thu Oct 17, 2013, 05:26 AM
Oct 2013

because of time and math and stuff" -- Former Governor and forever quitter Sarah Palin.

Ichingcarpenter

(36,988 posts)
4. I thought my time loss was due
Thu Oct 17, 2013, 07:00 AM
Oct 2013

to my alien abduction?
Well that's two thousandths of a second I'll never get back


Thanks Science

Bernardo de La Paz

(49,032 posts)
6. Ignorant "science" writers have no sense of scale. The "two 1000th sec per day" is obviously wrong.
Thu Oct 17, 2013, 10:18 AM
Oct 2013

If you multiply 2/1000 sec per day by the 200,000,000 years in the next paragraph, you get a huge number of hours, not the one hour extension of the day that would occur in that period. In other words, the article is internally inconsistent in a rather obvious way if you have a passing sense of the scale of time.

Elsewhere in the article it talks about 2 milliseconds per century (two thousandths of a second), which is consistent with the scale of the times involved. But in the first paragraph it applies it to each and "every day". A competent science writer or a competent proof-reader would catch such an obvious error.

Basing calculations on one hour retardation per 200,000,000 years and 3600 seconds per hour, we can divide out and get 55,556 years to lose one second. The reciprocal of that is 0.000018 seconds retardation per year, which is 0.018 milliseconds or 18 microseconds (nearly 20) per year or 2 milliseconds per century.

The article also claims that the internet packets travel in "perfectly timed" synchrony. A basic understanding of the internet reveals that the principle of operation explicitly does not require perfect timing. The packets are sent asynchronously and simply reassembled into the file at the receiving end. If the internet required perfect timing in the chain of dozens of computers involved in sending a web page, then it would fail immediately.

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