Since the eccentricities are small, we can assume that the orbits of the Earth around the Sun and the Moon around the Earth are both circles.

由于偏心率小，我们假定地球绕太阳的轨道和月球绕地球的轨道都是圆形。

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That the earth circles about the sun once is called a year.

地球围太阳转一圈称为一年。

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I used to squat on the floor in front of the jar and admire the copper and silver circles that glinted like a pirate 's treasure when the sun poured through the bedroom window.

我经常蹲在坛子前的地板上，欣赏坛子里的这些金圈和银圈，当阳光穿过窗子洒进卧室时，它们像海盗的财宝那样闪闪发光。

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It is thought to be made largely of rock and circles the Sun in an orbit that brings it close to our planet.

BBC: Foresight mission spacecraft Image