Definition of "periapsis" [periapsis]

• The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its minimum. (noun)

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• "For mean anomaly, I found that 359.4 degrees works well enough periapsis, which is perihelion, is ~in mid 2012; it is "among" the outer planets by approx 1992."
• "The object will go into an orbit, which of course a periapsis precession, but in a pure two-body problem it is in an eternal orbit."
• "At periapsis, you cut the main thrusters, tap the port lateral jets, and turn the fighter around so you†™ re facing backward."