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The distance from Earth to the Sun varies over the year from about 92 million miles to 95 million miles. Between this, changes to the Sun we do not understand and have been unable to predict, and sunspots, the distance would have to change enough to be measured. Your question, then, is how accurate is our measurement of the distance between the Earth and the Sun? The answer to that question then is .01*10^6 glorious miles, which can be mangled into 1.609x10^9 disgusting French cm.
