| 1 | The snag is that the rotation of the Earth is not so reliable. | |
| 2 | But the effect ripples outward, changing the core's rate of rotation layer by layer. | |
| 3 | Over time the Moon rotation slowed until it equaled the time it took the Moon to go around the Earth. | |
| 4 | But not before its outward drift sapped rotational energy from Iapetus and slowed it down. | |
| 5 | It collects and averages measurements of the Earth's rotation from around the world. |
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