Rate this post:
|Quote from Lester10 at 03:14 AM on August 22, 2009 :|
Earth's rate of rotation slowly but measurably declining.
Yes it is, because of tidal friction, the length of a day is increasing at a rate of about 2 milliseconds per day per century. This number is from the US Naval Observatory. What is a Leap Second?
So, if we look at the length of a day 370 million years ago, (370x10^6/100)*.002=7400 deconds=123 minutes, so a day was two hours shorter 370 million years ago, or 22 hours long.
Now, the earth still takes the same time around the sun, so a year is the same length. So, 365.25*24=8766 hours, 8766/22=398 days.
Now, looking at corals in the Devonian (370 million years ago):
Coral fossils living 400 million years ago (400 Ma) in the Early Devonian display years of 400 lines, and thus 400 days, proving that the Earth did indeed turn faster at that time. For corals that lived during the Upper Carboniferous (300 Ma), there are approximately 380 lines each year. The fossil record thus clearly demonstrates that Earth’s rotation has gradually slowed over time, and that it is still slowing down today.
A Devonian Day
This argument had it's origin when Dr. Dino thought that having leap seconds meant that the earth was slowing down one second per day per year. It's actually a demonstration of an old earth and creationist technical incompetence.
Pogge:” This is the volume of a sphere with a 62 kilometer (about 39 miles) radius, which is considerably smaller than the 2,000 mile radius of the Earth.”
Wikipedia:” For Earth, the mean radius is 6,371.009 km(≈3,958.761 mi; ≈3,440.069 nmi).”
Wisp to Lester (on Pogge): Do you admit he was wrong about the basics?