400 times larger than the Moon, it is 400 times further from the Earth than the Moon is. That is
the perfect eclipse is given by the orbital radius of the Earth to the Moon’s orbital radius
equals the Solar radius to the lunar radius :
The Earth's rotation is slowing down, and as a direct result, the Moon is slowly drifting away.
Earth's Rotation Slowing: The length of a day is increasing by about 2.3 milliseconds per
century. This is the long-term average rate caused primarily by the Moon's tidal pull. (Note that
this rate can be influenced by other factors; for example, climate change is currently contributing
about 1.33 milliseconds per century).
Moon's Orbit Growing: The Moon is receding from Earth at a rate of about 3.8 centimeters (1.5
inches) per year.
The Tidal Connection
These two phenomena are linked by tidal friction. The Moon's gravity creates tides in Earth's
oceans. As Earth rotates, the tidal bulges are pulled slightly ahead of the Moon, creating friction
that slows Earth's spin.
To conserve angular momentum in the Earth-Moon system, this loss of Earth's rotational speed is
transferred to the Moon, boosting its orbital energy and causing it to spiral outward into a larger
orbit. This recession rate has been precisely measured for decades using the Lunar Laser Ranging
experiment, which bounces lasers off reflectors left on the Moon by Apollo astronauts.
Long-Term Perspective
While these changes are tiny on human timescales, they have significant effects over millions of
years. About 250 million years ago, a day on Earth was roughly 23 hours long. In about 600
million years, the Moon will have drifted so far that total solar eclipses will no longer be
possible.
We take these quantum analogs for the Earth/Moon/Sun system to be nodes. They represent the
evolved state of the Solar System when intelligent life might be selected for, which may explain
why we are here now at such a node. The author put this theory forward in his paper The 24
Hour Day as an Evolutionary Attractor. [2] It’s abstract reads:
Abstract. We propose that the 24 hour rotation period of Earth is not a random fossil of
planetary formation, but a stable evolutionary attractor — the unique solution to a constrained
optimization problem in which diurnal foraging, nocturnal social assimilation, and sustained
celestial observation reach marginal equilibrium. A correction to the simple geometric threshold