Earth's Rotation Speeding Up

[D_Archer]

Ancient eclipses show Earth’s rotation is slowing:
https://www.sciencemag.org/news/2016/12 ... on-slowing

There have been about a million days since 720 B.C.,” says Leslie Morrison, an astronomer now retired from the Royal Observatory Greenwich in London. Over such a long time, even a gradual slowdown in Earth’s rotation becomes evident, he notes.
Not only that, the study also identifies short-term hiccups in the spin rate that have been missed by cruder models.

Comment:
A speeding up is a hiccup, i would say an influx of solar energy, ie more charge (real physical photons) coming in at the poles can boost the rotation a little, but it is a temporary effect. With the earth also cooling and the core hardening its ability to recycle charge becomes less and less (2nd law again) so any future boost will be less and less too...
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A New Study Just Revealed That Earth's Core Is Actually Leaking:

https://www.sciencealert.com/earth-s-co ... s-of-years

Earth's core started as entirely liquid metal and has been cooling and partially solidifying over time

Comment: the earth is cooling, heat is escaping...
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Regards,
Daniel

[nick c]

I recently came across this paper; it was a link in a file that I had on a different but somewhat related subject. Anyway, I thought it may be of interest to those that have participated and/or followed this thread.

Measurement of the Earth's rotation: 720 BC to AD 2015

[jacmac]

from: D_Archer,
https://www.sciencemag.org/news/2016/12 ...

Overall, Earth’s spin has slowed by about 6 hours in the past 2740 years, the team reports today in the Proceedings of the Royal Society A. That sounds like a lot, but it works out to the duration of a 24-hour day being lengthened by about 1.78 milliseconds over the course of a century.

But, working backward, today’s astronomers would have predicted that the eclipse should have been seen a quarter of a world away, somewhere in the western Atlantic Ocean.

2470 years = 24.7 centuries
24.7 x 1.78 = 48.77 milliseconds
48.77 milliseconds is not 6 hours !
What am I missing ???????????????

[jacmac]

oops:
That was actually 1.78 milliseconds PER DAY.

so..... 1.78 ms/day x 365 days/year x 2740 years

That is 1,780,178 ms
1,780.78 seconds
or 29.67 minutes.

Still not close to 6 hours ????
And what does that last "over the course of a century" mean ????

[D_Archer]

oops:
That was actually 1.78 milliseconds PER DAY.

so..... 1.78 ms/day x 365 days/year x 2740 years

That is 1,780,178 ms
1,780.78 seconds
or 29.67 minutes.

Still not close to 6 hours ????
And what does that last "over the course of a century" mean ????

i guess you have take the 6 hours as a percentage of ALL the hours in 2740 years...

876581277 hours (1 year) x 2740 = a lot

In 'a lot of time' the earth spin has slowed 6 hours, so there is 6 hours more time passed than when the earth kept the same rate of spin..

So the day has lengthened 1.78ms per 24hrs

('A lot' divided by 24 hours) x 1.78ms = the amount of milliseconds earth has slowed.

Regards,
Daniel

p.s i am just winging it , i could be wrong.

[Aardwolf]

If the earth has slowed by 1.78 ms over a century that equates to 0.00004877 ms per day. You then need to add that time cumulatively per below;

Day 1 = 0.00004877
Day 2 = 0.00004877 + 0.00004877
Day 3 = 0.00004877 + 0.00004877 + 0.00004877
and so on...

So for 2,740 years that is say 1,000,000 days. Taking the above out to 1,000,000 days then adding all days cumulatively = 24,383,586 ms.

24,383,586 ms = 6.8 hours.

[moses]

The article referenced by Daniel has an error. The spin slows by 1.78 ms per century and not 1.78 ms per day.

1000000 x .00004877 = 48.77 ms which is not 6 hours.

Mo

[Aardwolf]

The article referenced by Daniel has an error. The spin slows by 1.78 ms per century and not 1.78 ms per day.

1000000 x .00004877 = 48.77 ms which is not 6 hours.

Mo

The paper says.

“That sounds like a lot, but it works out to the duration of a 24-hour day being lengthened by about 1.78 milliseconds over the course of a century.”

That states 1.78 ms per day.