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1 .This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?
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2 .Happy New Year!
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3 .And don't feel bad about taking today off.
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4 .After all, you've traveled far.
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5 .And I'm not talking about the trip home from the party.
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6 .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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7 .At an average speed of about 67,000 miles per hour.
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8 .Again, not talking about the drive home from the party.
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9 .Of course, the trip was not a perfect circle.
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10 .As Kepler showed, the earth's orbit is an ellipse, with the sun at one of the two focal points.
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11 .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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12 .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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13 .And the earth rotated 365 and a quarter times during its sweep around the sun.
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14 .The trip took 8,766 hours.
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15 .Or 31,557,600 seconds.
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16 .Or 525,960 minutes just like this one.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Steve Mirsky.
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