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 : apsis
apoapsis
  اپاهباک   
apâhabâk

Fr.: apoapse   

The point in an orbit where the moving body lies furthest from the celestial body around which it turns.

Apoapsis, from → apo- + → apsis.

Apâhabâk, from apâ-, → apo-, + habâk, → apsis.

apsis (pl. apsides)
  هباک   
habâk

Fr.: apside   

The point of greatest or least distance of the orbit of a celestial body from a center of attraction. The closest point is the → periapsis, the further point the → apoapsis.

L. apsis "arch, vault," from Gk. hapsis "loop, arch," from haptein "fasten together".

Mod.Pers. habâk "top of the head; the summit of a mountain".

argument of periapsis
  آروزمان ِ پیراهباک   
âruzmân-e pirâhabâk

Fr.: argument du périastre   

The angular distance between the → ascending node of an object orbiting a → primary and its periapsis measured from the primary. Argument of periapsis is measured in the → orbital plane in the direction of motion. It is one of the → orbital elements. See also → argument of perigee, → argument of perihelion.

argument; → perigee.

periapsis
  پیراهباک   
pirâhabâk

Fr.: périapse   

The point in an orbit of a body where it is closest to its primary; opposite of → apoapsis.

peri- + → apsis.

time of periapsis passage
  زمان ِ گذر از پیراهباک   
zamân-e gozar az pirâhabâk

Fr.: temps de passage au périapse   

One of the → orbital elements, the time when the → secondary body reaches → periapsis.

time; → periapsis; → passage.