"It's reminiscent of the model they had of the Earth going around the sun in a circle, " he says.
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It was the Apollo group of asteroids, which circle the sun in oblong orbits, that occasionally cross Earth's.
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His finding that the planets circle the sun underpins much of modern science.
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Here's the explanation: If the Earth made a perfect circle round the sun, the seasons would be almost exactly equal.
NPR: Not All Seasons Are Created Equal
They'll punish you by making you kneel or do press-ups or put your thumb on the ground and make you keep walking in a circle, all under the hot sun.
CNN: ASIANOW - Asiaweek
This is the vicious circle for Mr Blair to ponder as he basks in the Tuscan sun.
ECONOMIST: Peer pressure
The North Cape is known as one of the few places in Norway where you can experience the midnight sun, a natural phenomena of 24 hours of sunlight occurring only in summer in certain spots above the Arctic Circle.
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