how fast is the earth slowing down?
Earth's rotation is slowing down, so it cannot be more than a few million years old. Pathlights, n.d. The age of the earth - 2. http://www.pathlights.com/ce_encyclopedia/05agee3.htm. The earth's rotation is slowing at a rate of about 0.005 seconds per year per year. This extrapolates to the earth having a fourteen-hour day 4.6 billion years ago, which is entirely possible. The rate at which the earth is slowing today is higher than average because the present rate of spin is in resonance with the back-and-forth movement of the oceans.