If we suppose the apastra of the two stars to occur simultaneously, there will be two minima, “but the maxima will be constant.”
Source: wiktionary
Apastra
Synonyms for "apastra"
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But if both motions proceed in the same sense, then the binary stars will traverse that half of their galactic orbit with their apastra forward.
Source: wiktionary
The rotation involved is that of the location of the peri- and apastra, i.e. the line of apsides of the ellipse: it is thus called apsidal motion.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.