Trans-lunar injection is a critical engine burn performed in low Earth orbit to accelerate a spacecraft to escape velocity. This maneuver changes the trajectory from a circular Earth orbit into an elongated path that intersects the Moon. It requires precise timing and fuel calculation to ensure the vehicle arrives at the correct lunar rendezvous point.
Heard on the job
The upper stage is performing nominally, preparing for TLI at T-plus 45 minutes.
Also heard as
- trans-lunar injection
Do not mix it up with
- LOI: TLI sends the spacecraft from Earth toward the Moon, while LOI slows it down to orbit the Moon upon arrival.