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Related to Periastron: periapsis, Pericenter
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  • noun

Synonyms for apsis

a domed or vaulted recess or projection on a building especially the east end of a church

References in periodicals archive ?
During the past 11 years, spanning three periastron passages, the Goddard group has developed a model based on routine observations of the stars using ground-based telescopes and multiple NASA satellites.
This effect is even more sensitive to the orbital parameters than the periastron precession is.
In July of 2011, the highly-eccentric Be star system Delta Scorpius was predicted to have an interaction between its companion star and its circumstellar disk during its periastron passage which takes place every eleven years.
The paper includes four other bright southern systems including Beta Phoenicis which has now apparently passed unobserved through periastron.
In planets the latter motion is called precession of perihelion; in stars it is either precession of periastron or precession of apsides.