Definition of "apastron" [ap•as•tron]

• The point of greatest separation between two stars, especially in a binary star situation. (noun)

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• "They had already passed apastron and were downward bound."
• "The station was outward bound for the apastron of its shortened and cometary path."
• "In this region, nearing apastron, no unusual velocity change was needed to alter orbit radically."