# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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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 parhun→ circle + -i adj. suffix. circular magnetic field   میدان ِ مغناتیسی ِ دایره‌ای   meydân-e meqnâtisi-ye dâyere-yiFr.: 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, ~ parhuniFr.: 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, ~ parhuniFr.: 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, ~ ~ dâyereyiFr.: 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-yiFr.: 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 pâydârFr.: 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, ~ ~ yeknavâxtFr.: mouvement circulaire uniforme   The motion of an object around a fixed point at a constant angular speed, and at constant radius.→ uniform; → circular; → motion.