The Receding Moon

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Normal Recession
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How the Moon recedes from Earth today.(1)

According to NASA, the Earth's moon is currently receding at a rate of 3.8 centimeters a year2. This recession causes the earth's rotation rate to slow due to the conservation of angular momentum. The Moon's recession is caused by the tides that it creates on the Earth.

The tides are bulges of the Earth (mainly oceanic) that align one toward the moon and another on the opposite side. However, the Earth's rotation causes the tidal bulges to offset from the Moon. This is illustrated to the right. The gravitational pull from the bulge pulls on the Moon adding to its acceleration and causing it to recede from Earth3.

If the Moon is moving away from us, then in the past it was closer. A very simple calculation bringing the Moon to the Roche Limit would put the Earth-Moon relationship at a maximum age of 9.6 billion years which is no problem for the proposed 4.5 billion year age by old-earthers4. However, due to physical laws of gravity, the Moon's recession would not have been constant. As the moon gets closer to Earth, gravitational effects exponentially increase. First of all, Earth's rotation would have been faster making a more offset bulge and thus bigger pull. Second of all, with the Moon being closer to Earth, the tidal bulges would have been more extreme and therefore providing for a larger pull56.

The Moon would have been in the Roche Limit only 1.2 billion years ago according to calculations made by Walt Brown in In the Beginning: Compelling Evidence for Creation and the Flood7 and Dr. Jason Lisle in Taking Back Astronomy8. This age is not adequate for the old-earth model which is support that the Earth-Moon system cannot be as old as the they claim.(9)

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