![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Apollo_13_timeline.svg/640px-Apollo_13_timeline.svg.png&w=640&q=50)
Circumlunar trajectory
Type of free-return trajectory / From Wikipedia, the free encyclopedia
In orbital mechanics, a circumlunar trajectory, trans-lunar trajectory or lunar free return is a type of free return trajectory which takes a spacecraft from Earth, around the far side of the Moon, and back to Earth using only gravity once the initial trajectory is set.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Apollo_13_timeline.svg/640px-Apollo_13_timeline.svg.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Circumlunar-free-return-trajectory.png/640px-Circumlunar-free-return-trajectory.png)