# perigee

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## 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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

## 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 following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Perigee

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.

## perigee

[′per·ə‚jē]
(astronomy)
The point in the orbit of the moon or other satellite when it is nearest the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## perigee

the point in its orbit around the earth when the moon or an artificial satellite is nearest the earth
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

## apogee

The farthest point. It often refers to the point at which a commercial satellite is farthest from the earth in its elliptical orbit. The "perigee" is the point closest to the earth.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
The calculated times of the full Moon and lunar perigee in January 1912 were separated by only six minutes.
Wood, a tide expert at the National Ocean Survey (later NOAA), was the first author to call attention to this date, which he noted as having the most extreme lunar perigee during the years 1600 to 1999 (The Strategic Role of Perigean Spring Tides, 1978, page 219).
Fergus Wood was apparently the first author to suggest that the extreme lunar perigee in January 1912 may have played a role in the origin of the Titanic iceberg.
During perigee, the lunar mass exerts a counter gravitational force on the earth.

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