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originally posted by: eriktheawful
The only way for a moon to do as you suggest (keep the Earth in darkness) is it would need to orbit the Earth in the exact same amount of time that it takes the Earth to orbit the sun (around 365 days), AND, it would have ended up between the Earth and Sun, AND it would need to be very large to completely engulf the Earth in shadow.
So, no, it won't work with the actual Moon we have now. There would also be the problem of that 365 day orbit around the Earth. I believe it would have to be much further than the Earth's gravitation well (which is about 1.5 million miles).
Have to check the math though.