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: 1279
site
  سیت   
sit

Fr.: site   

The position or location of a building, observatory, etc. especially as to its environment. → astronomical site.

M.E., from L situs "position, arrangement, site," from sinere "to let, leave alone, permit," cognate with Av. šiti- "place, abode, residence," as below.

Sit, from Av. šiti- "place, abode, residence," šitāy- "habitation, dwelling," from ši- "to live;" cognate with Skt. ksay- "to live, to stay," kséti "he dwells;" Gk. ktizein "to inhabit, build;" L. situs "position, site; situated."

site selection
  گزینش ِ سیت   
gozineš-e sit

Fr.: sélection de site   

The process of choosing a site for an astronomical observatory based on meteorology, seeing conditions, and access to the site.

site; → selection.

situate
  سیتیدن   
sitidan

Fr.: situer   

To place in a site or context; to locate.

From M.L. situatus, p.p. of situare "to place, locate," from L. situs "place, position."

Sitidan, from sit, → site, + -idan infinitive suffix.

situated
  سیتیده   
sitidé

Fr.: situé   

Having a site, situation or location.

P.p. of → situate.

situation
  سیتش   
siteš

Fr.: situation   

1) The manner of being placed with respect to surroundings.
2) Momentary state; a set of circumstances.

Verbal noun of → situate.

six
  شش   
šeš (#)

Fr.: six   

A cardinal number, five plus one.

M.E. six, sex; O.E. siex, syx, seox, sex, from P.Gmc. *sekhs (cf. O.S. seks, O.N., O.Fris. sex, M.Du. sesse, Du. zes, O.H.G. sehs, Ger. sechs, Goth. saihs), from PIE *seks-, cognate with Pers. šeš, as below.

Šeš, from Mid.Pers. šaš; Av. xšuuaš- "six;" cf. Skt. sás- "six;" Gk. hex; L. sex (Fr. six; Sp. seis); O.C.S. sesti; Lith. sesi; O.Ir. se; Welsh chwech; E. six, as above.

sixty
  شست   
šast (#)

Fr.: soixante   

A cardinal number, ten times six. → sexagesimal.

M.E.; O.E. sixtig, from → six + -tig a suffix of numerals denoting multiples of ten.

Šast "sixty;" Mid.Pers. šast "sixty;" Av. xšuuašti- "sixty;" cf. Skt. sasti- "six;" L. sexaginta "sixty."

size
  اندازه   
andâzé (#)

Fr.: taille   

The spatial dimensions, extent, proportions, amount, or degree of something.

M.E. syse originally "control, regulation, limit," from O.Fr. sise shortened form of assise "session, regulation, manner."

1) Andâzé "measure, size" from Mid.Pers. andâzag, handâcak "measure," handâxtan, handâz- "to measure," Manichean Mid.Pers. hnds- "to measure," Proto-Iranian *hamdas-, from ham-, → com-, + *das- "to heap, amass;" cf. Ossetic dasun/dast "to heap up;" Arm. loanword dasel "to arrange (a crowd, people)," das "order, arrangement,"

size parameter
  پارامون ِ اندازه   
pârâmun-e andâzé

Fr.: paramètre de taille   

A quantity that defines the type of → scattering.

size; → parameter.

skew
  کژال   
kažâl

Fr.: distordu   

General: Having an oblique direction or position; being in a slanted or unsymmetrical position.
Geometry: Two or more lines that are not parallel and do not intersect.
Statistics: Having → skewness.

From Old North French eskiuer "to shy away from, avoid," O.Fr. eschiver (Fr. esquiver "to shirk, dodge") "to eschew, keep away from;" related to shy.

Kažâl, from kaž "crooked, bent, being aside" (cf. Skt. kubja- "hump-backed, crooked," Pali kujja- "bent," L. gibbus "hump, hunch," Lith. kupra "hump") + -âl, → -al.

skew-symmetric tensor
  تانسور ِ پاد-همامون   
tânsor-e pâdhamâmun

Fr.: tenseur antisymétrique   

A tensor that is the negative of its → transpose. For example, a second-order covariant tensor Ajk if its components satisfy the equality: Ajk = - Akj. Also called antisymmetric tensor.

skew; → symmetric; → tensor.

Tânsor, → tensor; pâd-, → anti-; hamâmun, → symmetric.

skewness
  کژالی   
kažâli

Fr.: degré d'asymétrie   

A measure of the degree of asymmetry of a distribution. If the left tail (tail at small end of the distribution) is more pronounced that the right tail (tail at the large end of the distribution), the function is said to have → negative skewness. If the reverse is true, it has → positive skewness. If the two are equal, it has → zero skewness.

Noun from → skew + → -ness.

skin
  پوست   
pust (#)

Fr.: peau   

1) The external protective membrane or covering of an animal's body, or that surrounding the flesh of a fruit or vegetable.
2) The outer protective covering of a structure. → skin effect.

M.E., from O.N. skinn "animal hide;" cf. O.H.G. scinten, Ger. schinden "to flay, skin;" Ger. dialect schind "skin of a fruit," Flemish schinde "bark;" from PIE *sken- "to cut off."

Pust "skin;" Mid.Pers. pôst "skin;" O.Pers. pavastā- "thin clay envelope used to protect unbaked clay tablets;" Av. pastô-, in pastô.fraθanhəm "of the breadth of the skin;" Skt. pavásta- "cover," Proto-Indo-Iranian *pauastā- "cloth."

skin effect
  اُسکر ِ پوستی   
oskar-e pusti

Fr.: effet de peau   

The tendency of an → alternating current to concentrate in the outer layer of a conductor, caused by the → self-induction of the → conductor and resulting in increased → resistance.

skin; → effect.

sky
  آسمان   
âsmân (#)

Fr.: ciel   

The area high above the ground, buildings, landscape, or horizon.
The heavens or firmament, appearing as a great arch or vault.

M.E. from O.N. sky "cloud;" cf. O.E. sceo, O.S. scio "cloud;" O.H.G. scuwo, O.N. skuggi "shadow;" Goth. skuggwa "mirror;" PIE base *(s)keu- "to cover, conceal."

Âsmân "sky;" Mid.Pers. âsmân "sky, heaven;" O.Pers. asman- "heaven;" Av. asman- "stone, sling-stone; heaven;" cf. Skt. áśman- "stone, rock, thunderbolt;" Gk. akmon "heaven, meteor, anvil;" Akmon was the father of Ouranos (Uranus), god of sky; Lith. akmuo "stone;" Rus. kamen; PIE base *akmon- "stone, sky." The link between the "stone" and "sky" concepts indicates that the sky had once been conceived as a stone vault by prehistoric Indo-Europeans.

sky background
  پس‌زمینه‌ی ِ آسمان   
paszamine-ye âsmân

Fr.: fond du ciel   

The emission of a part of the night sky that does not contain any detectable objects. Sky background results from the combined radiation from faint, unresolved stars and other emitting astronomical objects. The mean brightness of night sky background measured at the → Cerro Tololo Inter-American Observatory (CTIO) for the period 1992 to 2006 are: U = 22.12, B = 22.82, V = 21.79, R = 21.19, and I = 19.85 mag arcsec-2 ( → rms ~ 0.2 mag arcsec-2). See also → sky brightness.

sky; → background..

sky brightness
  درخشندگی ِ آسمان   
deraxšandegi-ye âsmân

Fr.: brillance du ciel   

Atmospheric (→ airglow, → auroral emission, → artificial light) or extraterrestrial (→ scattered  → sunlight from Moon, scattered → starlight, → interplanetary dust) foreground light that → interferes with → observations.

sky; → brightness.

sky subtraction
  زیرکرشش ِ آسمان   
zirkaršeš-e âsmân

Fr.: soustraction de ciel   

The act or instance of removing the contribution of non-related, intervening foreground light to the object.

sky; → subtraction.

sky survey
  بردید ِ آسمان   
bardid-e âsmân

Fr.: relevé du ciel   

The observation and recording of large extents of the sky with a particular instrument using one or more wavelengths in the same spectral domain. → survey.

sky; → survey.

skyglow
  نور ِ شهر، فروغ ِ آسمان   
nur-e šahr, foruq-e âsmân

Fr.: illumination du ciel   

The illumination of the night sky in urban areas caused by wasted light shining upward scattered off dust, humidity, and air. Skyglow is a type of → light pollution that results from light fixtures emitting a portion of their light directly upward into the sky. Light scattered in the atmosphere creates an orange-yellow glow above a city or town. Skyglow interferes with sensitive astronomical instruments designed to capture light from distant stars, nebulae, and galaxies. Skyglow can often be detected hundreds of kilometers away.

sky; → glow.

Nur, → light; foruq, → glow; šahr, → city; âsmân, → sky.

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