ellipticity of spheroid

例句：

1. 1.The planet's ellipticity affects its rotation speed.
   行星的椭圆度影响其旋转速度。
2. 2. The astrophysicist calculated the ellipticity of the star.
   天文学家计算了这颗星的椭圆度。
3. 3. The shape of the moon is determined by its ellipticity.
   月亮的形状由它的椭圆度决定。