In fact, the US Naval Observatory has to add leap seconds continually just to keep the timekeeper accurate. We know the earth is slowing down, which means there wasn't a 24 hour day in the past, but much shorter, maybe as much as 21 hours. Extrapolating backwards at the same rate, if the earth was 4.5 billion years old, it would have spun so fast so as to make it inhabitable due to the Coriolis Effect. If the earth didn't slow at the same rate as it measurably is currently, then old-agers have to figure out why that is.
We know that the Earth's rotation is only slowing by .005 seconds per year. Adding that up over 4.5 billion years, that's nowhere near fast enough to spin everybody off the planet or whatever nonsense. It's just a 14-hour day. Moreover, the rate at which the Earth is slowing
today is faster than the rate at which it slowed in the past, due to harmonic reasonance with the Earth's oceans.
We can verify this model, as well. Fossil corals preserve daily records of growth. From these fossils, we know that Earth's day was 22 hours long about 370 million years ago, which is entirely consistent with the model.
It's entirely inconsistent with the scenario you've describe above. 5000 years ago, the Earth's day would have been only 25 seconds shorter - not a whole three hours as you assert.
CE011: Earth's rotation slowing
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