Periapsis meaning

pĕr'ē-ăp'sĭs
The point at which an orbiting object is closest to the center of mass of the body it is orbiting.
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The nearest point to the gravitational center in the orbit of any satellite.
noun
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The point at which an orbiting object is closest to the center of mass of the body it is orbiting. This point is sometimes given a name that is specific to the body being orbited. For example, the periapsis of an object orbiting Earth is its perigee (from gaia , the Greek word for Earth), and the periapsis of an object orbiting the Sun is its perihelion (from hēlios , the Greek word for Sun). According to Kepler's laws of planetary motion , an object is at its greatest velocity at the periapsis.
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(astronomy) 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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Origin of periapsis

  • peri- +"Ž apsis
    From Wiktionary