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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

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Happy New Year!

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And don't feel bad about taking today off.

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After all, you've traveled far.

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And I'm not talking about the trip home from the party.

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According to NASA, just by being on the planet earth in the last year, you've zipped about 584 million miles around the sun to get back where you were.

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At an average speed of about 67,000 miles per hour.

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Again, not talking about the drive home from the party.

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Of course, the trip was not a perfect circle.

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As Kepler showed, the earth's orbit is an ellipse, with the sun at one of the two focal points.

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He also figured out the planet goes faster when it's at perihelion, nearer the sun, than when it's at aphelion, its furthest distance.

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Which would explain why summer seems to zip by, except the seasons are a function of the tilt of the earth's axis, not its different distances from the sun.

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And the earth rotated 365 and a quarter times during its sweep around the sun.

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The trip took 8,766 hours.

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Or 31,557,600 seconds.

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Or 525,960 minutes just like this one.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Steve Mirsky.

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