Definition of periastron in English:

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periastron

Pronunciation: /ˌperēˈastrən/

noun

Astronomy
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.

Origin

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

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