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: 1307
cause
  ۱) بنار؛ ۲) بناریدن   
1) bonâr; 2) bonâridan

Fr.: 1) cause; 2) causer   

1) A → reason for an → action or → condition; something that brings about an → effect or a → result.
2) To be the cause of; bring about.

From L. causa "reason, purpose," of unknown origin.

Bonâr, from bon "basis, root, origin, ground", from Mid.Pers. bun "base, root, origin;" Av. buna- "ground" (cf. Skt. budhna- "ground, bottom, depth", L. fundus "bottom", PIE base *bhud-/*bhund-) + âr short form of âvar present stem of âvardan "to cause or produce; to bring," → production; compare with Ger. die Ursache "cause," from ur- "primal" + die Sache "thing, matter."

caustic
  سوچان   
sucân

Fr.: caustique   

1) Capable of burning, corroding, or destroying living tissue. A caustic substance.
2) Optics: The enveloping surface formed by light rays reflecting or refracting from a curved surface. → caustic curve, → caustic surface.

M.E., from O.Fr. caustique, from L. causticus "burning," from Gk. kaustikos "capable of burning," from kaust(os) "combustible," from kaiein "to burn" + -ikos, → -ic.

Sucân, from suc- "to burn," variant of suz-, suzidan, suxtan "to burn;" cf. Baluci suc-, soc-; Mid.Pers. sôxtan, sôzidan "to burn;" Av. base saoc- "to burn, inflame" sūcā "brilliance," upa.suxta- "inflamed;" cf. Skt. śoc- "to light, glow, burn," śocati "burns," (caus.) socayati, śuc- "flame, glow," śoka- "light, flame;" PIE base *(s)keuk- "to shine."

caustic curve
  خم ِ سوچان   
xam-e sucân

Fr.: courbe caustique   

The intersection of a → caustic surface with a plane passing through the beam of rays.

caustic; → curve.

caustic surface
  رویه‌ی ِ سوچان   
ruye-ye sucân

Fr.: surface cuastique   

In an → optical system, the → envelope of all the → reflected or → refracted rays (by a → mirror or a → lens respectively) which do not come to a common focal point because of geometrical → aberration. This occurs when parallel rays of light fall on a → concave mirror or when a → convex lens receives parallel light. In the case of → spherical aberration, the caustic surface has an axis of symmetry.

caustic; → surface.

causticity
  سوچانی   
sucâni

Fr.: causticité   

The quality of being physically caustic.

caustic; → -ity.

cavity
  کاواک   
kâvâk (#)

Fr.: cavité   

1) An apparently hollow formation in the structure of an astronomical object, for example a sizable hole on the surface of a → molecular cloud created by → ultraviolet photons of a → massive star.
2) In a semiconductor laser, two reflective parallel edges forming a resonator that amplifies the light through stimulated emission.

From M.Fr. cavité, from L.L. cavitas "hollowness," from L. cavus "hollow."

Kâvâk, related to verb kâvidan (kâftan) "to dig; to examine, investigate," cf. L. cavus "hollow" (E. derivatives: cavity, concave, cave, excavate), Gk. koilos "hollow," Armenian sor, PIE *kowos "hollow."

CCD
  سی‌سی‌دی   
si-si-di (#)

Fr.: CCD   

charge-coupled device.

Short for → charge + coupled, from → couple, + → device.

CCD array
  آرست ِ سی‌سی‌دی   
ârast-e sisidi

Fr.: détecteur CCD bidimensionnel   

A CCD detector having two dimensions.

CCD; → array.

CCD detector
  آشکارگر ِ سی‌سی‌دی   
âškârgar-e sisidi (#)

Fr.: détecteur CCD   

charge-coupled device.

CCD; → detector.

CCD frame
  تک تصویر ِ سی سی دی   
tak-tasvir-e sisidi

Fr.: image CCD   

One of a series of astronomical images obtained using a CCD detector in particular for calibration purposes.

CCD; → frame.

CCD gain
  بهره‌ی ِ سی‌سی‌دی   
bahre-ye CCD

Fr.: gain de CCD   

In a → CCD detector, the ratio of the initial number of electrons in a → pixel to the final number of → analog-to-digital units (or counts) reported by camera software. For example, a gain of 1.8 e-/count means that the camera produces 1 count for every 1.8 recorded electrons.

charge-coupled device (CCD); → gain.

CCD shutter
  بستار ِ سی‌سی‌دی   
bastâr-e si-si-di, bastâvar-e ~

Fr.: obturateur CCD   

A mechanical device of a CCD camera that controls the duration of a an exposure, as by opening and closing to allow the stellar light to expose the CCD detector.

Shutter, from to shut, from O.E. scyttan from W.Gmc. *skutjanan + → -er.

CDM model
  نگره‌ی ِ ماده‌ی ِ سرد ِ تاریک   
negare-ye mâdde-ye sard-e târik

Fr.: théorie de la matière noire froide   

A → cosmological model that attributes the formation of structures in the → early Universe to an exotic particle (→ cold dark matter) which was → non-relativistic at the time of → decoupling. According to this model, CDM began clumping together soon after the → Big Bang, while the → baryonic matter was still coupled with the → photons, and prevented to condense. Smaller → clumps of dark matter merged to form larger and larger clumps, and when the normal visible matter had decoupled from the photons, at the → recombination era (380,000 years after the Big Bang), it collapsed onto these dark matter clumps. In this way, the dark matter clumps acted as seeds for galaxy formation.

cold; → dark; → matter; → theory.

celestial
  آسمانی   
âsmâni (#)

Fr.: céleste   

Of or relating to the sky or visible heavens.

M.E., from O.Fr., from M.L. celestialis, from L. cælestis "heavenly," from cælum "heaven, sky."

Âsmâni related to âsmân, → sky.

celestial axis
  آسه‌ی ِ آسمانی   
âse-ye âsmân (#)

Fr.: axe du monde   

The Earth's axis extended to the → celestial pole.

celestial; → axis.

celestial body
  اختر، جسم ِ آسمانی   
axtar (#), jesm-e âsmâni (#)

Fr.: corps céleste   

astronomical object.

celestial; → body.

celestial coordinates
  هماراهای ِ آسمانی   
hamârâhâ-ye âsmâni (#)

Fr.: coordonées célestes   

Any system of coordinates used to define a point on the celestial sphere (zenith distance, altitude, celestial latitude, celestial longitude, etc.).

celestial; → coordinates.

celestial equator
  هموگار ِ آسمانی   
hamugâr-e âsmâni

Fr.: équateur céleste   

An imaginary great circle on the sky half-way between the → celestial poles. It is the projection of the → equator of the Earth on the sky.

celestial; → equator.

celestial globe
  گوی ِ آسمانی   
gu-ye âsmâni

Fr.: globe céleste   

A small globe representing the celestial sphere, on which the apparent positions of the stars are indicated.

celestial; → globe.

celestial horizon
  افق ِ آسمانی   
ofoq-e âsmâni (#)

Fr.: horizon céleste   

A great circle on the → celestial sphere having a plane that passes through the center of the Earth at a right angle to the line formed by an observer's → zenith and → nadir.

celestial; → horizon.

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