Orbits and mechanics
地影
Earth's shadow
The stretch where a satellite passes behind Earth and loses sunlight.
The brightest passes come just after sunset, with the satellite still lit.
Related terms
- Escape velocity — The minimum speed needed to leave a body's gravity.
- Atmospheric reentry — A spacecraft coming back into the atmosphere.
- Hohmann transfer — A two-burn manoeuvre that moves between circular orbits on minimum fuel.
- Orbital plane — The plane an orbit lies in, tilted by its inclination.