An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 5 Search : encounter
close encounter
  رویارویی ِ کیپ   
ruyâruyi-ye kip

Fr.: rencontre proche   

1) In a → star cluster, coming across of two stars so closely that their → orbits alter by their mutual → gravitational attractions.
2) As regards an → asteroid or → comet, a situation when it crosses the Moon's orbit and approaches the Earth with a risk of collision. See also → close approach, → encounter.

close; → encounter.

encounter
  رویارویی   
ruyâruyi (#)

Fr.: rencontre   

General: A meeting, especially one that is unplanned, unexpected, or brief. An often violent meeting; a clash.
Coming across of two bodies (as two stars in a cluster) which results in the deviation from original directions of motion. → close encounter; → strong encounter; → weak encounter.

From O.Fr. encountrer "confront," from encontre "against, counter to," from L.L. incontra "in front of," from L. in- "in" + contra "against."

Ruyâruyi "being face to face," from ru, ruy "face, countenance," variant rox (Mid.Pers. rôy, rôdh "face," Av. raoδa- "growth," in plural "appearance," from raod- "to grow, sprout, shoot," cf. Skt. róha- "rising, height") + euphonic interfix -â- + ruy + noun suffix -i.

gravitational encounter
  رویارویی ِ گرانشی   
ruyâruyi-ye gerâneši

Fr.: rencontre gravitationnelle   

An encounter in which two moving bodies alter each other's direction and velocity by mutual → gravitational attraction.

gravitational; → encounter.

strong encounter
  رویارویی ِ سترگ   
ruyâruyi-ye sotorg

Fr.: rencontre proche   

In a star cluster, a → close encounter that strongly changes a star's velocity.

strong; → encounter.

weak encounter
  رویارویی ِ نزار   
ruyâruyi-ye nezâr

Fr.: rencontre faible   

In a → star cluster, an → encounter that occurs at a distance and produces only very small changes in a star's velocity.

weak; → encounter.