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英语小论文:地球公转与季节的变化

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英语小论文:地球公转与季节的变化
A circular motion about an external point,e.g.the Earth about the Sun,is called an orbit or more properly an orbital revolution.The seasons causes are by the tilt of the Earth's rotational axis away or to ward the sun as it travels through its year-long path around the sun.Relative to the background stars,it takes the Earth,on average,23 hours,56 minutes and 4.091 seconds (one sidereal day) to rotate around the axis that connects the north and the south poles from west to east.