perigee(redirected from Perigeum)
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Related to Perigeum: Apogeum
perigee(pĕr`ĭjē), point nearest the earth in the orbit of a body about the earth. See apsisapsis
(pl. apsides), point in the orbit of a body where the body is neither approaching nor receding from another body about which it revolves. Any elliptical orbit has two apsides.
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perigee(pe -ră-jee) The point in the orbit of the Moon or an artificial Earth satellite that is nearest the Earth and at which the body's velocity is maximal. Strictly, the distance to the perigee is taken from the Earth's center. The distance to the Moon's perigee varies; on average it is about 363 300 km. Compare apogee.
Perigee(religion, spiritualism, and occult)
Every orbit is elliptical. When a satellite is closest to Earth, it is at its perigee (from the Greek peri, meaning “near,” and gaia, meaning “earth”).
the point in the orbit of the moon or an artificial satellite that is nearest the earth. Perturbations change the position of the perigee in space. Thus, because of perturbations caused by the sun, the moon’s perigee moves along an orbit in the same direction as the moon, completing a revolution in 8.85 years. The shift in the perigee of an artificial earth satellite chiefly arises from the aspherical nature of the earth, and the magnitude and direction of this motion depend on the inclination of the orbital plane of the satellite to the plane of the earth’s equator. The distance from the perigee to the center of the earth is called the perigee distance.