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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Number of Results: 9 Search : circular
circular
  دایره‌ای، پرهونی   
dâyere-yi (#), parhuni (#)

Fr.: circulaire   

1) Having the form of a circle.
2) Moving in or forming a circle or a circuit.

M.E. circuler, O.Fr. circuler, from L. circularis, from circulus, → circle, + -aris "-ar," variant of → -al, joined to words in which an l precedes the suffix (circular; lunar; singular).

Dâyere-yi, parhuni, from dâyeré or parhuncircle + -i adj. suffix.

circular magnetic field
  میدان ِ مغناتیسی ِ دایره‌ای   
meydân-e meqnâtisi-ye dâyere-yi

Fr.: champ magnétique circulaire   

A → magnetic field whose lines of force (→ line of force) run around the perimeter of the magnet.

circular; → magnetic; → field.

circular motion
  جنبش ِ دایره‌ای، ~ پرهونی   
jonbeš-e dâyere-yi, ~ parhuni

Fr.: mouvement circulaire   

Motion in which an object moves in a circle at a constant speed. The velocity, however, changes not because the magnitude of the velocity changes, but because its direction changes. The changing velocity creates an acceleration, called → centripetal acceleration. This acceleration results from the → centripetal force.

circular; → motion.

circular orbit
  مدار ِ دایره‌ای، ~ پرهونی   
madâr-e dâyere-yi, ~ parhuni

Fr.: orbite circulaire   

The path of a object in → circular motion.

circular; → orbit.

circular polarization
  قطبش ِ پرهونی، ~ دایره‌ای   
qotbeš-e parhuni, ~ dâyereyi (#)

Fr.: polarisation circulaire   

The → polarization of an → electromagnetic radiation in which the electric field vector describes a circle about the direction of propagation at any point in the path of the radiation. Circular polarization is a combination of two perpendicular → linearly polarized waves that are 90 degrees out of phase with each other. Circular polarization may be referred to as "right-hand" or "left-hand," depending on the rotation direction as viewed by the observer.

circular; → polarization.

circular variable filter (CVF)
  پالایه‌ی ِ ورتنده‌ی ِ پرهونی، ~ ~ دایره‌ای   
pâlâye-ye vartande-ye parhuni, ~ ~ dâyereyi

Fr.: filtre circulaire variable   

Circular band-pass interference filter whose thickness and central wavelength vary along the perimeter. They are used in low-resolution spectrophotometers mainly in the infra-red.

circular; → variable; → filter.

circularly polarized light
  نور ِ قطبیده‌ی ِ دایره‌ای   
nur-e qotbide-ye dâyere-yi

Fr.: lumière polarisée circulairement   

Light exhibiting → circular polarization.

circular; → polarized; → light.

innermost stable circular orbit (ISCO)
  درونیترین مدار ِ دایره‌ای ِ پایدار   
darunitarin madâr-e dâyere-yi-ye pâydâr

Fr.: orbite circulaire stable intérieur   

The smallest → circular orbit in which a particle can stably orbit a → black hole according to → general relativity without the risk of falling past the → event horizon. In other words, the ISCO is the inner edge of the → accretion disk around a black hole. Therefore, characteristics of accretion disks depend on ISCO. The radius of ISCO is calculated to be three times the → Schwarzschild radius (3 RSch). ISCO is closer to event horizon for rotating black hole.

inner; → stable; → circular; → orbit.

uniform circular motion
  جنبش ِ دایره‌ای ِ یکدیس، ~ ~ یکنواخت   
jonbeš-e dâyereyi-ye yekdis, ~ ~ yeknavâxt

Fr.: mouvement circulaire uniforme   

The motion of an object around a fixed point at a constant angular speed, and at constant radius.

uniform; → circular; → motion.