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: 13116 Search : far
astronomical coordinates
  هماراها‌ی اخترشناسیک، ~ اخترشناختی   
hamârâhâ-ye axtaršenâsik, ~ axtarsršnâxti (#)

Fr.: coordonnées astronomiques   

Values in a reference system used to relate the position of a body on the celestial sphere.

astronomical; → coordinates.

astronomical horizon
  افق ِ اخترشناسیک   
ofoq-e axtaršenâsik

Fr.: horizon astronomique   

The intersection of a plane perpendicular to the radius of the Earth through the observer's eye with the celestial sphere. Same as → true horizon. Because the → celestial sphere has an infinite radius, two observers at different heights above sea level, but placed on the same vertical line, have the same astronomical horizon. Because of → dip of the horizon, the astronomical horizon always lies above the → sea horizon. But on land it is usually hidden by trees, hills, and buildings which determine the observer's → apparent horizon.

astronomical; → horizon.

astronomical instrument
  سازال ِ اخترشناسیک   
sâzâl-e axtaršenâsik

Fr.: instrument astronomique   

A device used to observe and study → astronomical objects.

astronomical; → instrument.

astronomical latitude
  ورونای ِ اخترشناسیک   
varunâ-ye axtaršenâsik

Fr.: latitude astronomique   

The angle between the → equatorial plane and the true → vertical at a point on the surface.

astronomical; → latitude.

astronomical object
  بر‌آخت ِ اخترشناسیک، ~ اختری   
barâxt-e axtaršenâsik, ~ axtari

Fr.: objet astronomique   

A naturally occurring physical entity or association that lies beyond the Earth's atmosphere and can be studied observationally. In other words, a gravitationally bound structure that is associated with a position in space, but may consist of multiple independent astronomical objects. A list of astronomical objects includes → planets, → asteroids, → comets, → stars, → nebulae, galaxies (→ galaxy), → galaxy clusters, → pulsars, and → black holes. Note that → celestial body, → celestial object, and → heavenly body are less technical terms for these entities.

astronomical; → object.

astronomical observatory
  نپاهشگاه ِ اخترشناسیک، ~ اخترشناختی   
nepâhesgâh-e axtaršenâsik, ~ axtaršenâxti

Fr.: observatoire astronomique   

A building, place, or institution designed and equipped for making → observations of astronomical phenomena.

astronomical; → observatory.

astronomical refraction
  شکست ِ اخترشناختی   
šekast-e axtaršenâxti

Fr.: réfraction astronomique   

The → angular → displacement of a point on the → celestial sphere due to the Earth's → atmospheric refraction.

astronomical; → refraction.

astronomical site
  سیت ِ اخترشناسیک، ~ اخترشناختی   
sit-e axtaršenâsik, ~ axtaršenâxti

Fr.: site astronomique   

A certain place whose characteristics, as to location, altitude, atmospheric conditions, etc., make it appropriate for astronomical observations.

astronomical; → site.

astronomical table
  جدول ِ اختری   
jadval-e axtari

Fr.: table astronomique   

One of a set of tables giving parameters used for calculations of positions of the Sun, the Moon, and the planets in particular in pre-telescopic astronomy. The oldest known astronomical tables are those of Ptolemy. In Modern astronomy it is usually replaced by the term → ephemeris. Same as → zij. See also → Toledan Tables, → Alfonsine Tables.

astronomical; → table.

astronomical twilight
  نیمتاب ِ اخترشناسیک، ~ اخترشناختی   
nimtâb-e axtaršenâsik, ~ axtarsnâxti

Fr.: crépuscule astronomique   

One of the twilight phases when the Sun's center lies between 12 and 18 degrees below the horizon. Astronomical twilight is followed or preceded by → nautical twilight. Most stars and other celestial objects can be seen during this phase. However, some of the fainter stars and galaxies may not be observable as long as the Sun is less than 18 degrees below the horizon. See also → civil twilight.

astronomical; → twilight.

astronomical unit (au)
  یکا‌ی ِ اخترشناسیک، ~ اخترشناختی   
yekâ-ye axtaršenâsik, ~ axtaršenâxti (#)

Fr.: unité astronomique   

1) A unit of length equal to 149 597 870 700 m exactly, with symbol "au" (re-definition at the International Astronomical Union's 28th General Assembly in Beijing, China, August 20-31). The astronomical unit equals 1.5813 × 10-5 → light-years and 4.8481 ×10-6 → parsecs.
2) Previous definition: The radius of a circular orbit in which a body of negligible mass, and free of perturbations, would revolve around the Sun in 2 π / k days, where k is the → Gaussian gravitational constant. This is slightly less than the semi-major axis of the Earth's orbit.

astronomical; → unit.

astronomy
  اخترشناسی   
axtaršenâsi (#)

Fr.: astronomie   

The science of the celestial bodies and the Universe, dealing especially with the positions, dimensions, distribution, motion, chemical composition, energy, and evolution of celestial bodies and phenomena.

O.Fr. astronomie, from L. astronomia, from Gk. astronomia, from → astro- "star" + nomos "arranging, regulating," related to nemein "to deal out."

Axtaršenâsi, from axtar "star," → astro- + -šenâsi "knowledge" from šenâxtan "to know, to discern."

astroparticle physics
  فیزیک ِ اخترذره   
fizik-e axtar-šzarre

Fr.: physique des astroparicules   

The area of science which deals with → elementary particle and → high-energy phenomena in → astrophysics and → cosmology.

astro-; → particle; → physics.

astrophotography
  اختر‌شیدنگاری، شیدنگاری ِ اختری   
axtar-šidnegâri, šidnegâri-ye axtari

Fr.: astrophotographie   

The photography of stars, other celestial bodies, and stellar fields.

astro-, → photography.

astrophotometry
  اخترشیدسنجی، شیدسنجی ِ اختری   
axtar-šidsanji, šidsanji-ye axtari

Fr.: astrophotométrie   

The measurement of the intensity of light of celestial bodies.

Astrophotometry, from → astro- + → photometry.

Axtar-šidsanji, from axtar-, → astro-, + -šidsanji, → photometry.

astrophysical
  اخترفیزیکی   
axtarfiziki (#)

Fr.: astrophysiqie   

Of or pertaining to → astrophysics.

astrophysics + → -al

astrophysical jet
  شان ِ اخترفیزیکی   
šân-e axtarfiziki

Fr.: jet astrophysique   

A very fast moving, → collimated beam of → ionized gas at high temperatures associated with most classes of compact objects that spin and/or accrete matter from their surroundings, such as → protostars, → X-ray binary systems, and, at a larger scale, with → active galactic nuclei, → gamma-ray bursts, and → quasars. In general, jet sources host → accretion disks and are associated with → magnetic fields. Astrophysical jets, despite their different physical scales and power, are morphologically very similar, suggesting a common physical origin. For example, in one extreme, → active galactic nuclei jets have typical sizes ≥ 106 pc, velocities near that of light c, and parent sources (→ massive black holes) with masses 106-9  Msun and luminosities ~ 1043-48Lsun; while in the other extreme, → young stellar objects jets have typical sizes ≤ 1 pc, velocities ≤ 10-3 c, and emerge from low mass protostars with masses ~ 1 Msun and luminosities (0.1-2 × 104Lsun. Jets play an important → feedback role in the evolution of their host systems. See also: → jet launching.

astrophysical; → jet.

astrophysical object
  بر‌آخت ِ اخترفیزیکی   
barâxt-e axtarfiziki

Fr.: objet astrophysique   

An extraterrestrial → object whose physical properties and formation are studied in → astrophysics.

astrophysical; → object.

astrophysicist
  اخترفیزیکدان   
axtarfizikdân (#)

Fr.: astrophysicien   

A scientist who studies → astrophysics.

astro-; → physicist. The term astrophysicist was introduced by Greenwich astronomer Edwin Dunkin in 1869.

astrophysics
  اخترفیزیک   
axtarfizik (#)

Fr.: astrophysique   

The branch of → astronomy that deals with the → physics of → celestial objects and the → Universe in general. It relies on the assumption that the → laws of physics apply everywhere in the Universe and throughout all time. See also → observational astrophysics, → theoretical astrophysics.

Astrophysics, from → astro- "star" + → physics. The first use of the term astrophysics has been attributed to Johann Karl Friedrich Zöllner (1834-1882) in 1865. He defined it as a coalescence of physics and chemistry with astronomy (History of Astronomy: An Encyclopedia, ed. John Lankford, Routledge, 1997).

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con con con con con con con con con con con con coo Cor Cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>