the point at which the stars of a binary system are farthest apart (opposed to periastron).
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How to use apastron in a sentence
They wouldn't live to be crushed by disappointment when the Sky Fire receded as Beta went into the long swing toward apastron.Oomphel in the Sky | Henry Beam Piper
Scientific definitions for apastron
The point at which an object, such as a planet or comet, is farthest from the center of mass of the star it is orbiting. Compare periastron.
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