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: 13176 Search : in
Planck scale
  مرپل ِ پلانک   
marple-e Planck

Fr.: échelle de Plancck   

1) A general term for anything roughly the size of the → Planck length.
2) Similarly, an energy on the order of the → Planck energy.

Planck; → scale.

Planck spectrum
  بیناب ِ پلانک   
binâb-e Planck

Fr.: spectrum de Planck   

Same as → blackbody spectrum.

Planck; → spectrum.

Planck time
  زمان ِ پلانک   
zamân-e Planck

Fr.: temps de Planck   

The time representing the → Planck length divided by the → speed of light. It is expressed by: tP = (Għ/c5)1/2≅ 5.4 x 10-44 s, where G is the → gravitational constant, ħ is the → reduced Planck's constant, and c is the → speed of light. At the Planck time, the mass density of the Universe is thought to approach the → Planck density.

Planck; → time.

Planck units
  یکاهای ِ پلانک   
yekâhâ-ye Planck (#)

Fr.: unités de Planck   

A set of → natural units in which the normalized units are: the gravitational constant, Planck's constant, the speed of light, the Coulomb constant, and Boltzmann's constant.

Planck; → unit.

Planck's blackbody formula
  دیسول ِ سیه‌جسم ِ پلانک   
disul-e siyah jesm-e Planck

Fr.: formule du corps noir de Planck   

A formula that determines the distribution of intensity of radiation that prevails under conditions of thermal equilibrium at a temperature T: Bv = (2hν3 / c2)[exp(hν / kT) - 1]-1 where h is Planck's constant and ν is the frequency.

Planck; → blackbody; → formula.

Planck's constant
  پایای ِ پلانک   
pâyâ-ye Planck (#)

Fr.: constante de Planck   

Planck constant.

Planck; → constant.

Planck's radiation law
  قانون ِ تابش ِ پلانک   
qânun-e tâbeš-e Planck

Fr.: loi du rayonnement de Planck   

An equation that expresses the energy radiated per unit area per unit time per unit wavelength range by a blackbody as a function of temperature. It is expressed by → Planck's blackbody formula.

Planck; → radiation; → law.

plane
  ۱) هامُن؛ ۲) تخت   
1) hâmon (#); 2) taxt (#)

Fr.: plan   

1) (n.) a flat or level surface.
2) (adj.) Of or pertaining to planes or plane figures.

1) From L. plantum "flat surface," noun use of adj. planus "flat, level, plain."
2) From L. planus, as above.

1) Hâmon, variant of hâmun "plain, level ground;" Mid.Pers. hâmôn "level, flat;" Proto-Iranian *hāma-van-, from *hāma- "same, equally, even; together, with" (Mod.Pers./Mid.Pers. ham-; O.Pers./Av. ham-; cf. Skt. sam-; also O.Pers./Av. hama- "one and the same;" Skt. sama-; Gk. homos-; originally identical with PIE numeral *sam- "one," from *som-. The Av. ham- appears in various forms: han- (before gutturals, palatals, dentals) and also hem-, hen-) + *-van- suffix.
2) Taxt "flat;" Mid.Pers. taxtag "tablet, plank, (chess)board."

plane figure
  شکل ِ هامن، ~ تخت   
šekl-e hâmon, ~ taxt

Fr.: figure plane   

A two-dimensional geometric figure. The points of the figure lie entirely in a plane.

plane; → figure.

plane mirror
  آینه‌ی ِ تخت   
âyene-ye taxt (#)

Fr.: miroir plan   

A mirror whose reflective surface is neither concave nor convex.

plane; → mirror.

plane of polarization
  هامن ِ قطبش   
hâmon-e qotbeš

Fr.: plan de polarisation   

In a → linearly polarized light, a plane perpendicular to the → plane of vibration and containing the direction of propagation of light. It is also the plane containing the direction of propagation and the magnetic vector (H) of the electromagnetic light wave.

plane; → polarization.

plane of rotation
  هامن ِ چرخش   
hâmon-e carxeš

Fr.: plan de rotation   

For a rotating object, the plane → perpendicular to the → rotation axis.

plane; → rotation.

plane of the sky
  هامن ِ آسمان   
hâmon-e âsmân

Fr.: plan du ciel   

An imaginary plane that is perpendicular to the → line of sight.

plane; → sky.

plane of vibration
  هامن ِ شیوش   
hâmon-e šiveš

Fr.: plan de vibration   

In a → linearly polarized light, a plane perpendicular to the → plane of polarization and containing the direction of propagation of light. It is also the plane containing the direction of propagation and the electric vector (E) of the electromagnetic light wave.

plane; → polarization.

plane polarization
  قطبش ِ هامنی   
qotbeš-e hâmoni

Fr.: polarisation plane   

Same as → linear polarization.

plane; → polarization.

plane polarized light
  نور ِ قطبیده‌ی ِ هامنی   
nur-e qotbide-ye hâmoni

Fr.: lumière polarisée plane   

Light exhibiting → plane polarization. Same as → linearly polarized light.

plane; → polarized; → light.

plane wave
  موج ِ تخت   
mowj-e taxt (#)

Fr.: onde plane   

A wave whose wavefronts of constant phase are infinite parallel planes normal to the direction of propagation.

plane; → wave.

plane-parallel atmosphere
  هواسپهر ِ پراسو-تخت، جو ِ ~   
havâsepehr-e parâsu-taxthâ, javv-e ~

Fr.: atmosphère plan-parallèle   

An approximation used in many stellar atmosphere models that depict the atmosphere as being only one-dimensional and bounded at the top and bottom by horizontal plane surfaces normal to the direction of gravity.

plane; → parallel; → atmosphere.

plane-parallel plate
  تیغه‌ی ِ تخت-پراسو   
tiqe-ye taxt-parâsu

Fr.: lame plan-parallèle   

A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture.

plane; → parallel; → plate.

planemo
  پلنمو   
planemo

Fr.: planemo   

An object with a mass greater than an → asteroid, but smaller than that of a → brown dwarf.

Short for planetary mass object; → planetary; → mass; → object.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe 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 cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl 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 > >>