An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 495
logâritmi (#)

Fr.: logarithmique   

Of or pertaining to a → logarithm.

logarithm; → -ic.

logarithmic extinction
  خاموشی ِ لگاریتمی   
xâmuši-ye logâritmi

Fr.: extinction logarithmique   

Same as → reddening coefficient.

logarithmic; → extinction.

logarithmic scale
  مرپل ِ لگاریتمی   
marpel-e logâritmi

Fr.: échelle logarithmique   

A scale of measurement in which an increase of one unit represents a tenfold increase in the quantity measured (for common logarithms)

logarithmic; → scale.


Fr.: livre de bord, journal de navigation, carnet de vol, carnet d'observations   

A book in which details of a trip made by a ship or aircraft are recorded; log (

log; → book.

  گوییک، چمگوییک   
guyik, cemguyik (#)

Fr.: logique   

1) The science that investigates the principles governing correct or reliable inference.
2) The system or principles of reasoning applicable to any branch of knowledge or study.
3) A particular method of reasoning or argumentation.

M.E. logik; O.Fr. logique, from L. (ars) logica, from Gk. logike (techne) "reasoning (art)," from feminine of logikos "pertaining to speaking or reasoning," from logos "reason, idea, word."

Guyik, from guy- present stem of goftan "to say, speak, relate, tell; to compose a poem," from Mid.Pers. guftan "to say, tell, utter;" O.Pers. gaub- "to say" + -ik, → -ic.
Cemguyik, from Mid.Pers. cimgôwâgih "logic," from cim "cause, reason, meaning" (Proto-Iranian *cahmāt "what for;" cf. Skt. kasmāt "why, where from," kim "what") + gôwâgih Mod.Pers. guyi, as above.

logic diagram
  نمودار ِ گوییکی   
nemudâr-e guyiki

Fr.: diagramme logique   

A diagram that uses special symbols called logic symbols to represent the detailed functioning of electronic logic circuits. The symbols do not represent the type of electronics used, but only their functions.

logic; → diagram.

  گوییک، گوییکی، گوییکوار   
guyik, gyuiki, guyikvâr

Fr.: logique   

1) According to or agreeing with the principles of logic.
2) Reasoning in accordance with the principles of logic, as a person or the mind.
3) Of or pertaining to logic (

logic; → -al.

logical connective
  هابندار ِ گوییکی   
hâbandâr-e guyiki

Fr.: connecteur logique   

A symbol that can be combined with one or more → sentences in order to form a new sentence. For example "and" (∧), "or" (∨) "not" (¬), "if-then" (→), and "iff" (⇔).

logical; → connective.

logically equivalent
  گوییکانه هموگ‌ارز   
guyikâné hamug-arz

Fr.: logiquement équivalent   

Describing two → compound propositions → if and only if they have the same → truth table.

logical; → equivalent.


Fr.: identification, connexion   

1) The act of logging in to a database, mobile device, or computer, especially a multi-user computer or a remote or networked computer system.
2) A user name and password that allows a person to log in to a computer system, network, mobile device, or user account (

log; → in.

lognormal distribution
  واباژش ِ لگاریتمی-هنجارور   
vâbâžeš-e logâritmi-hanjârvar

Fr.: distribution logarithmico-normale   

A → probability distribution in which the natural logarithm (logX) of the → random variable (X) has a → Gaussian distribution.

logarithm; → normal distribution.


Fr.: fin de session, déconnexion   

The process by which a computer user logs out.

log; → out.

Lomb-Scargle periodogram
  دوره‌نگاشت ِ لومب-اسکارگل   
dowrenegâšt-e Lomb-Scargle

Fr.: périodogramme de Lomb-Scargle   

An algorithm for detecting and characterizing periodic signals in unevenly-sampled data. The Lomb-Scargle periodogram has a particularly wide use within the astronomy community. This method allows efficient computation of a Fourier-like → power spectrum estimator from such unevenly-sampled data, resulting in an intuitive means of determining the period of oscillation (see VanderPlas, 2017, astro-ph/1703.09824 and references therein).

Named after Lomb, N. R. 1976, Ap&SS 39, 447 and Scargle, J. D. 1982, ApJ 263, 835; → periodogram.

derâz (#)

Fr.: long   

1) Having considerable linear extent in space. → very-long-baseline interferometry (VLBI).
2) Having considerable duration in time. → long-period variable.

M.E. longe, O.E. lang, long, akin to O.H.G., Ger. lang "long," O.N. langr, M.Du. lanc, Goth. laggs "long," L. longus, → longitude.

Derâz "long," Mid.Pers. drâz "long;" O.Pers. darga- "long;" Av. darəga-, darəγa- "long," drājištəm "longest;" cf. Skt. dirghá- "lon (in space and time)."

long-period comet
  دمدار ِ درازدوره   
domdâr-e derâz dowré

Fr.: comète à longue période   

A comet with orbital period of more than 200 years. → short-period comet; → periodic comet.

long; → period; → comet.

long-period variable
  ورتنده‌ی ِ درازدوره   
vartande-ye derâz dowré

Fr.: variable à longue période   

A type of → variable star in which variations in brightness occur over long time-scales of months or years. The term generally refers to → Mira variable types.

long; → period; → variable.


Fr.: longitude   

The angular distance on the Earth's surface, measured east or west from the prime meridian at Greenwich to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds.

L. longitudo "length," from longus "long," cognate with Pers. derâz, as below, Gk. dolikhos "elongated;" O.H.G., Ger. lang, O.N. langr, M.Du. lanc, Goth. laggs "long;" PIE base *dlonghos- "long."

Derežnâ, from derež (Kurdi, Laki), variants darg "length; long, tall" (Zâzâ), darγ (Ossetic), derâz "long" + -nâ noun forming suffix from adjective, as in derâznâ, pah(n)nâ, farâxnâ, tangnâ, tiznâ. The first element from Mid.Pers. drâz "long;" O.Pers. darga- "long;" Av. darəga-, darəγa- "long," drājištəm "longest;" cf. Skt. dirghá- "long (in space and time);" PIE *dlonghos- "long," as above.

longitude of ascending node
  درژنای ِ گره ِ فرازشی   
derežnâ-ye gereh-e farâzeši

Fr.: longitude du nœud ascendant   

One of the → orbital elements used to specify the orbit of an object in space. It is the angle from the reference direction, called the origin of longitude, to the direction of the → ascending node, measured in the reference plane.

longitude; → ascending node.


Fr.: longitudinal   

Of or pertaining to longitude or length. Extending in the direction of the length.

Adj. of → longitude.

longitudinal magnetic field
  میدان ِ مغناطیسی ِ درژنایی   
meydân-e meqnâtisi-ye derežnâyi

Fr.: champ magnétique longitudinal   

1) A → magnetic field whose lines of force (→ line of force) run parallel to the long axis of the → magnet. Longitudinal magnetization of a component can be accomplished using the longitudinal field set up by a → coil or → solenoid. It can also be accomplished using permanent magnets or electromagnets.
2) In → stellar magnetic field observations, the magnetic field along the → line of sight.

longitudinal; → magnetic; → field.

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