An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



<< < -ci cal Cam can car Car Cas cat CCD Cel cen CGS cha cha che chi CI cir cir Cla cli clo clu Coa coe coi col col com com com com com com com com com con con con con con con con con con con coo cor cor cor cos cos cot cou cra cre cri cro cub cur cya cyl > >>

Number of Results: 1244
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.

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.

celestial latitude
  ورونای ِ آسمانی   
varunâ-ye âsmâni

Fr.: latitude céleste   

Angular distance → north or → south measured from the → ecliptic to a → celestial object.

celestial; → latitude.

celestial longitude
  درژنای ِ آسمانی   
derežnâ-ye âsmâni

Fr.: longitude céleste   

Angular distance to an object measured eastward along the → ecliptic from the → vernal equinox.

celestial; → longitude.

Derežnâ, → longitude; âsmânicelestial.

celestial mechanics
  مکانیک ِ آسمانی   
mekânik-e âsmâni (#)

Fr.: mécanique céleste   

The branch of astronomy that deals with the calculation of motions of celestial bodies under the action of their mutual gravitational attractions.

celestial; → mechanics.

Mekânik, → mechanics; âsmâni, → celestial.

celestial meridian
  نیمروزان ِ آسمانی   
nimruzân-e âsmâni (#)

Fr.: méridien céleste   

The great circle on the → celestial sphere, passing through the two → celestial poles and the observer's → zenith.

celestial; → meridian.

celestial object
  بر‌آخت ِ آسمانی   
barâxt-e âsmâni

Fr.: objet céleste   

astronomical object.

celestial; → object.

celestial pole
  قطب ِ آسمان   
qotb-e âsmân (#)

Fr.: pole céleste   

The point of the sky, north or south, where the projection of the Earth's axis of rotation intersects the → celestial sphere. They are at 90° relative to the → celestial equator. Because of → precession, the celestial poles describe a circle around the ecliptic's poles every 25,800 years.

celestial; → pole.

celestial sphere
  سپهر ِ آسمانی، کره‌ی ِ ~   
sepehr-e âsmân (#), kore-ye ~ (#)

Fr.: sphère céleste   

An imaginary sphere, of large but indefinite dimension, used as a basis to define the position coordinates of celestial bodies. The center can be the Earth, the observer, or any other point which plays the role of origin for a given system of coordinates. Seen from the Earth, the celestial sphere rotates around the → celestial axis every 23h 56m 04s (the → sidereal day), as a result of the Earth's rotation. Two important circles on the celestial sphere are the → celestial equator and the → ecliptic. The angle between them, about 23.40 degrees, is known as the → obliquity of the ecliptic. The celestial equator and the ecliptic intersect at two points, → vernal equinox and → autumnal equinox. The positions of the → celestial poles and therefore that of the → celestial equator move gradually on the celestial sphere, due to → precession.

celestial; → sphere.

  ۱، ۲) یاخته؛ ۳) پیل، باتری   
1, 2) yâxté (#); 3) pil, bâtri (#)

Fr.: 1, 2) cellule; 3) élément, pile   

1) General: A small compartment or bounded area forming part of a whole.
2) Fluid mechanics: A body of fluid (air, liquid, or → plasma) in which the process of → convection proceeds.
3) Electricity: A device for producing electric current by chemical action.

From L. cella "small room, hut," related to L. celare "to hide, conceal," from PIE base *kel- "conceal" (cf. Skt. cala "hut, house," Gk. kalia "hut, nest," kalyptein "to cover").

Yâxté "small room, closet," etymology unknown.

<< < -ci cal Cam can car Car Cas cat CCD Cel cen CGS cha cha che chi CI cir cir Cla cli clo clu Coa coe coi col col com com com com com com com com com con con con con con con con con con con coo cor cor cor cos cos cot cou cra cre cri cro cub cur cya cyl > >>