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Assuming the earth moves in a circular orbit around the sun, the distance it moves in a year is the circumference of the circle:

c = 2 * PI * r

Given r = 150,000,000km, then c = 942,477,796km.

Now to compute the number of seconds in a year:

s = 365.24 * 60 * 60 * 24, so s = 31,556,736.

So the earth travels c/s km in a second, or 29.866km.

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