earth

代码说明：

  设计卫星绕地球运动的图象。要求：地球的直径≥5cm，卫星用五角星表示，卫星轨迹呈椭圆其中一部分轨迹被地球遮挡。(Design of the satellite around the earth in the image. Requirements: Earth' s diameter ≥ 5cm, with a five-pointed star, said the satellite, the satellite orbit was elliptical orbit by the Earth blocking part.)