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The Sun is fairly round, so you can apply the formula for a sphere. The circumference is simply the diameter multiplied by pi.

The radius of the sun is estimated to be about 432,450 miles, so the diameter is about 864,900 miles.

That suggests a circumference of about 2,717,161 miles (2.7 million miles).

But since the sun is a ball of gas, there is no definite solid surface to measure. Astronomers have to use an estimate based on their estimate of where the properties of the gases schange significantly enough to be considered a "surface."

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11y ago

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