noun (plural periapses /-ˌsēz/)Astronomy
The point in the path of an orbiting body at which it is nearest to the body that it orbits.
- For objects orbiting Earth, periapsis and apoapsis are known as perigee and apogee; for objects orbiting the Sun, these locations are known as perihelion and aphelion.
- At periapsis [closest approach to Saturn] it's about 40 kilometers per second [90,000 miles per hour].
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