Periastron (noun) Definition, Meaning & Examples

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noun, plural per·i·as·tra [per-ee-as-truh]. /ˌpɛr iˈæs trə/. Astronomy.
  1. the point at which the stars of a binary system are closest (opposed to apastron).
noun
  1. the point in the orbit of a body around a star when it is nearest to the star, esp applied to double-star systems
Plural periastra
    Periastron (noun) Definition, Meaning & Examples

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