Kepler orbit

例句：

1. 1.The Kepler orbit is the first orbit of a planet around its sun.
   开普勒轨道是行星围绕其太阳的首个轨道。
2. 2. Kepler's laws describe the motion of planets in their Kepler orbits.
   开普勒定律描述了行星在其开普勒轨道上的运动。
3. 3.Astronomers use Kepler's laws to calculate the distances between stars and planets.
   天文学家使用开普勒定律来计算恒星和行星之间的距离。