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 : far
variability index
  دیشن ِ ورتندگی   
dišan-e vartandegi

Fr.: indice de variabilité   

A measure of variability of a star (such as Welch-Stetson variability index) which combines the information from two passbands assuming that changes in the star's luminosity occur nearly simultaneously at all optical wavelengths.

variability; → index.

variable
  ورتنده   
vartandé

Fr.: variable   

Something that may or does vary. → variable star.
Math.: A symbol, usually a letter, which in a mathematical or logic expression represents any member of a set of possible values or possible objects.

M.E., from O.Fr. variable, from L. variabilis "changeable," from variare "to change," → vary.

Vartandé agent noun from vartidan "to change," → vary.

variable star
  ستاره‌ی ِ ورتنده   
setâre-ye vartandé

Fr.: étoile variable   

A star whose luminosity changes over periods of time; there are many reasons and many types. → cataclysmic variable; → Cepheid; → pulsating star; → nova; → long-period variable; → short-period variable; → Luminous Blue Variable (LBV); etc.

variable; → star.

variable star designation
  نامگزینی ِ ستاره‌ی ِ ورتنده   
nâmgozini-ye setâre-ye vartandé

Fr.: designation des étoiles variables   

A set of conventions used for naming → variable stars. Stars with existing → Bayer designations are not given new designations. Alternatively, the letters R through Z are used followed by the Latin genitive of the name of the hosting constellation. Otherwise, two letters of alphabet are used (334 combinations) with the Latin genitive of the name of the constellation. Finally, the letter V (variable) is used followed by numbers 335, 336, and so on. Some examples are: → P Cygni, → T Tauri, → FU Orionis, → EX Lupi, and → V2052 Oph.

variable; → star; → designation.

variance
  ورتایی   
vartâyi

Fr.: variance   

A measure of the scatter of the values of a random variable (X) about its mean (μ). Var(X) = E(X -μ)2. The positive square root of the variance is called the → standard deviation.

M.E., from O.Fr. variance, from L. variantia, from variare "to change," → vary.

Vartâyi quality noun from vartâ agent noun from vartidan, → vary.

variant
  ورتا   
vartâ

Fr.: variante   

1) Liable to or displaying variation.
2) Something that differs from a standard or type. For example, a different form of the same word.

vary.

variate
  ورتنده‌ی ِ کاتوره   
vartande-ye kâturé

Fr.: variable aléatoire   

A quantity which may take any of the values of a specified set with a specified relative frequency or probability. The variate is therefore often known as a → random variable.

L. variatus, p.p. of variare, → vary, + → -ate.

variable; → random.

variation
  ورتش   
varteš

Fr.: variation   

1) General: An instance of changing, or something that changes.
2) Astro.: The periodic inequality in the Moon's motion that results from the combined gravitational attraction of the Earth and the Sun. Its period is half the synodic month, that is 14.77 days, and the maximum longitude displacement is 39'29''.9.
See also: → calculus of variations, → annual variation, → secular variation.

M.E., from O.Fr. variation, from L. variationem (nominative variatio) "difference, change," from variatus, p.p. of variare "to change," → vary.

Varteš, verbal noun from vartidan, → vary.

variational
  ورتشی   
varteši

Fr.: variationnel   

Of or describing a → variation.

variation; → -al.

variational principle
  پروز ِ ورتشی   
parvaz-e varteši

Fr.: principe variationnel   

Any of the physical principles that indicate in what way the actual motion of a state of a mechanical system differs from all of its kinematically possible motions or states. Variational principles that express this difference for the motion or state of a system in each given instant of time are called → differential. These principles are equally applicable to both → holonomic and → nonholonomic systems. Variational principles that establish the difference between the actual motion of a system during a finite time interval and all of its kinematically possible motions are said to be → integral. Integral variational principles are valid only for holonomic systems. The main differential variational principles are: the → virtual work principle and → d'Alembert's principle.

variational; → principle.

variety
  ورتینه   
vartiné

Fr.: variété   

1) The quality or state of having different forms or types.
2) A number or collection of different things especially of a particular class.
3) Something differing from others of the same general kind.
4) Any of various groups of plants or animals ranking below a species (Merriam-Webster.com).

M.Fr. variété, from L. varietatem (nominative varietas) "difference, diversity; a kind, variety, species, sort," from varius, → various.

Vartiné, from vartin, → various, + noun/nuance suffix .

Varignon's theorem
  فربین ِ وری‌نیون   
farbin-e Varignon

Fr.: théorème de Varignon   

The → moment of the resultant of a → coplanar system of → concurrent forces about any center is equal to the algebraic sum of the moments of the component forces about that center.

Named after Pierre Varignon (1654-1722), a French mathematician, who outlined the fundamentals of statics in his book Projet d'une nouvelle mécanique (1687).

various
  ورتین   
vartin

Fr.: varié   

1) Of different kinds, as two or more things; differing one from another.
2) Marked by or exhibiting variety or diversity (Dictionary.com).

M.Fr. varieux and directly from L. varius "changing, different, diverse," → vary.

Vartin, from vart "change," present stem of vartidan, → vary, + adj. suffix -in.

vary
  ۱) ورتیدن؛ ۲) ورتاندن   
vartidan

Fr.: changer, varier   

1) To undergo change in form, substance, appearance, etc.
2) To change or alter. → covariance.

M.E. varien, from O.Fr. varier, from L. variare "change, alter, make different," from varius "variegated, different, spotted."

Vartidan "to change," from Mid.Pers. vartitan "to change, turn" (Mod.Pers. gardidan "to turn, to change"); Av. varət- "to turn, revolve;" cf. Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" L. vertere "to turn;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend."

vector
  بردار   
bordâr (#)

Fr.: vecteur   

Any physical quantity which requires a direction to be stated in order to define it completely, for example velocity. Compare with → scalar.

From L. vector "one who carries or conveys, carrier," from p.p. stem of vehere "carry, convey;" cognate with Pers. vâz (in parvâz "flight"); Av. vaz- "to draw, guide; bring; possess; fly; float," vazaiti "guides, leads" (cf. Skt. vah- "to carry, drive, convey," vahati "carries," pravaha- "bearing along, carrying," pravāha- "running water, stream, river;" O.E. wegan "to carry;" O.N. vegr; O.H.G. weg "way," wegan "to move," wagan "cart;" M.Du. wagen "wagon;" PIE base *wegh- "to drive").

Bordâr "carrier," agent noun from bordan "to carry, transport" (Mid.Pers. burdan; O.Pers./Av. bar- "to bear, carry," barəθre "to bear (infinitive);" Skt. bharati "he carries;" Gk. pherein "to carry;" L. ferre "to carry;" PIE base *bher- "to carry").

vector analysis
  آنالس ِ برداری   
ânâlas-e bordâri

Fr.: analyse vectorielle   

The study of → vectors and → vector spaces.

vector; → analysis.

vector angular velocity
  بردار ِ تندای ِ زاویه‌ای   
bordâr-e tondâ-ye zâviye-yi

Fr.: vecteur de vitesse angulaire   

Of a rotating body, a vector of magnitude ω (→ angular velocity) pointing in the direction of advance of a right-hand screw which is turned in the direction of rotation.

vector; → angular; → velocity.

vector boson
  بوسون ِ برداری   
boson-e bordâri

Fr.: boson vectoriel   

In nuclear physics, a → boson with the spin quantum number equal to 1.

vector; → boson.

vector calculus
  افماریک ِ برداری   
afmârik-e bordâri

Fr.: calcul vectoriel   

The study of vector functions between vector spaces by means of → differential and integral calculus.

vector; → calculus.

vector density
  چگالی ِ بردار   
cagâli-ye bordâr

Fr.: densité de vecteur   

A → tensor density of → order 1.

vector; → density.


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