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apsis
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apsis

Either of two points in an orbit, one being at maximum and the other at minimum distance from the controlling central body. The apogee and perigee of the Moon are apsides, as are the aphelion and perihelion of a planet.



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? Mentioned in ? References in periodicals archive
 
In planets the latter motion is called precession of perihelion; in stars it is either precession of periastron or precession of apsides.
DI Hercules relates to relativity by Science News
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