An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

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.

Having a site, situation or location.

P.p. of → situate.

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

Verbal noun of → situate.

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.

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."

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,"

The number of → edges.

→ size; → graph.

A quantity that defines the type of → scattering.

→ size; → parameter.

A person who questions the validity or authenticity of something purporting to be factual.

From M.Fr. sceptique and directly from L. scepticus "the sect of Skeptics," from Gk. skeptikos "thoughtful, inquiring" (plural Skeptikoi "the Skeptics, followers of Gk. philosopher Pyrrho," who lived c. 360-270 B.C.). from skeptesthai "to reflect, look, view," → spectrum.

Šakdâvar, šakmand, from šakk, → doubt, + -âr contraction od âvardan "to bring, to cause, to produce," → cause, or -mand suffix of relation/possession.

1) Inclined to skepticism; having an attitude of doubt.
2) Doubtful about a particular thing.

→ skeptic; → -al.

1) A doubting or questioning attitude or state of mind.
2a) The ancient school of Pyrrho of Elis that stressed the uncertainty of our beliefs in order to oppose dogmatism.
2b) The doctrine that absolute knowledge is impossible, either in a particular domain or in general.
2c) A methodology based on an assumption of doubt with the aim of acquiring approximate or relative certainty.
3) Doubt or disbelief of religious tenets (TheFreeDictionary.com).

→ skeptic; → -ism.

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.

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

→ skew; → symmetric; → tensor.

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

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.

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."

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.

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.

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..

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

→ sky; → brightness.

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

→ sky; → subtraction.