Definition of periastron in English:

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Pronunciation: /ˌpɛrɪˈastrən/


The point nearest to a star in the path of a body orbiting that star.
Example sentences
  • Also, relativistic advance of periastron has been studied and confirmed in certain binary stars with elliptical orbits.


Mid 19th century: from peri- 'around' + Greek astron 'star', on the pattern of perigee and perihelion.

For editors and proofreaders

Line breaks: peri|astron

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