Orbits and mechanics
近地点
Perigee
The closest point of an orbit to Earth.
The lower the perigee, the more drag and the shorter the life.
Related terms
- Two-line element set (TLE) — A 69-character-per-line format that encodes an orbit.
- Earth's shadow — The stretch where a satellite passes behind Earth and loses sunlight.
- Delta-v — The velocity change needed to alter an orbit.
- Escape velocity — The minimum speed needed to leave a body's gravity.