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Encyclopedia > Perigee

Perigee is the point at which an object in orbit around the Earth makes its closest approach to the Earth. This term commonly refers to the moon but can be applied to any earth-orbiting body, such as artificial satellites. Often the term is used in a broader sense to define the point in an orbit where the orbitting body is closest to the body it orbits. In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... Earth (IPA: , often referred to as the Earth, Terra, or Planet Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth largest. ... Bulk composition of the Moons mantle and crust estimated, weight percent Oxygen 42. ... For other uses, please see Satellite (disambiguation) A satellite is an object that orbits another object (known as its primary). ...


The Greek prefix "peri" means close or near. The suffix "gee" means Earth.


Perigee is part of the broader family of Apsis, astronomical terms which denote distances of orbiting bodies. Since all orbits are elliptical, each orbit contains both a nearest point and a farthest point. A diagram of Keplerian orbital elements. ...


See also

A diagram of Keplerian orbital elements. ... The eccentric anomaly is the angle between the direction of periapsis and the current position of an object on its orbit, projected onto the ellipses circumscribing circle perpendicularly to the major axis, measured at the centre of the ellipse. ... Two bodies with similar mass orbiting around a common barycenter with elliptic orbits. ...

External links

  • Apogee - Perigee Photographic Size Comparison
  • Perigee: Publication for the Arts This publication was founded in 2003, and features poetry, prose, and visual art. Submissions from the general public are considered year round.

  Results from FactBites:
 
Perigee - Wikipedia, the free encyclopedia (176 words)
Perigee is the point at which an object in orbit around the Earth makes its closest approach to the Earth.
Perigee is part of the broader family of Apsis, astronomical terms which denote distances of orbiting bodies.
Perigee: Publication for the Arts This publication was founded in 2003, and features poetry, prose, and visual art.
Lunar Perigee and Apogee Calculator (742 words)
For each perigee and apogee the distance in kilometres between the centres of the Earth and Moon is given.
Perigee and apogee distances are usually accurate to within a few kilometres compared to values calculated with the definitive ELP 2000-82 theory of the lunar orbit; the maximum error over the years 1977 through 2022 is 12 km in perigee distance and 6 km at apogee.
Following the flags is the interval between the moment of perigee or apogee and the closest new or full phase; extrema cluster on the shorter intervals, with a smaller bias toward months surrounding the Earth's perihelion in early January.
  More results at FactBites »

 
 

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