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: 177 Search : log
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.

login
  درلوگ   
darlog

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 (Dictionary.com).

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.

logout
  والوگ   
vâlog

Fr.: fin de session, déconnexion   

The process by which a computer user logs out.

log; → out.

lunar geology
  زمین‌شناسی ِ ماه   
zaminšenâsi-ye mâh

Fr.: géologie lunaire   

The study of the → Moon's → crust, → rocks, strata (→ stratum), etc.

lunar; → geology.

magneto-asteroseismology
  مغنات-اخترلرزه‌شناسی   
meqnât-axtarlarzešenâsi

Fr.: magnéto-astérosismologie   

Combined study of the large-scale → magnetic field (→ magnetometry) and → stellar pulsations (→ asteroseismology). Magneto-asteroseismology provides strong complementary diagnostics suitable for detailed stellar modeling and permits the determination of the → internal structure and conditions within → magnetic massive  → pulsators, for example the effect of magnetism on → mixing processes. More specifically, asteroseismology yields information on the → density, → composition, and → chemical mixing in multiple internal layers (depending on the number of studied frequencies). Additionally, when rotationally split pulsation modes are observed, the internal rotation profile can be retrieved. From magnetometry surface properties are determined, related to the → chemical composition, including → starspots, and the magnetic field, such as its geometry, obliquity, and strength. Magnetic studies also provide constraints about the → stellar wind geometry and the → circumstellar environment. Moreover, the stellar → rotation period period and the → angle of inclination toward the observer are also retrieved (Buysschaert et al., 2017, astro-ph/1709.02619).

magneto-; → asteroseismology.

mean catalog place
  جای ِ میانگین ِ کاتالوگی   
jâ-ye miyângin-e kâtâlogi

Fr.: position catalogue moyenne   

That point on the → celestial sphere at which an object would be seen from the solar system → barycenter affected by the → e-terms → aberration.

catalog; → mean; → place.

Messier catalog
  کاتالوگ ِ مسیه   
kâtâlog-e Messier

Fr.: catalogue de Messier   

A catalog of more than 100 nebulous-appearing astronomical objects, initially established to avoid confusion with comets. These objects are now well known to be among the brightest and most striking gaseous nebulae, star clusters, and galaxies. The designations of the catalog are still used in identification; e.g. M1 is the Crab Nebula (in Taurus).

In honor of the French astronomer Charles Messier (1730-1817), who compiled the list between 1760 and 1784 in order to avoid confusion with comets; → catalog.

meteorological observation
  نپاهش ِ هواشناختی   
napâheš-e havâšenâxti

Fr.: observation météorologique   

Evaluation or measurement of one or more meteorological elements.

Meteorological, of or pertaining to → meteorology; → observation.

meteorological observatory
  نپاهشگاه ِ هواشناختی   
nepâhešgâh-e havâšenâxti

Fr.: observatoire météorologique   

A scientific establishment dedicated to making precise and detailed meteorological observations and to studying and forecasting atmospheric phenomena by means of special equipments.

Meteorological, of or pertaining to → meteorology; → observatory.

meteorology
  هواشناسی   
havâšenâsi (#)

Fr.: météorologie   

The study of the physics, chemistry, and dynamics of the Earth's atmosphere, including the related effects at the air-earth boundary over both land and the oceans.

From Gk. meteorologia "discussion of celestial phenomena," from meteoronmeteor + -logia, &rarr-logy.

Havâšenâsi, from havâ "weather, air," → air.

metrology
  اندازه‌شناسی   
andâze-šenâsi

Fr.: métrologie   

The science of measurement, embracing both experimental and theoretical determinations at any level of uncertainty in any field of science and technology.

From metro-, a combining form meaning "measure," → meter, + → -logy.

Andâze-šenâsi, from andâzé, → measure, + -šenâsi, → -logy.

Milne cosmological model
  مدل ِ کیهان‌شناختی ِ میلن   
model-e keyhânšenâxti-ye Milne (#)

Fr.: modèle cosmologique de Milne   

Same as → Milne Universe.

Milne Universe; → cosmological; → model.

morphologic
  ریخت‌شناختی   
rixtšenâxti (#)

Fr.: morphologique   

Of or relating to → morphology. Same as morphological

morphology; → -ic.

morphological
  ریخت‌شناختی   
rixtšenâxti (#)

Fr.: morphologique   

Of or relating to → morphology. Same as morphological

morphologic; → -al.

morphological classification
  رده‌بندی ِ ریخت‌شناختی   
radebandi-ye rixtšenâxti (#)

Fr.: classification morphologique   

A classification scheme of galaxies based on their apparent shape. → Hubble classification.

morphological; → classification.

morphology
  ریخت، ریخت‌شناسی   
rixt, rixtšenâsi (#)

Fr.: morphologie   

1) The study of the form or → structure of anything.
2) The → form and structure of a whole entity under study.
3) Linguistics: The structure of → words in a → language, including patterns of → inflections and → derivation. The study and description of such structures.

From Gk. morphe "form, shape, outward appearance" + → -logy.

Rixt "shape, the way something is cast, as in founding," past stem of rixtan "to cast; to pour; to flow" (Mid.Pers. rēxtan and rēcitan "to flow;" Av. raēk- "to leave, set free; to yield, transfer," infinitive *ricyā; Mod.Pers; rig in morderig "heritage" (literally, "left by the dead"); cf. Skt. rinakti "he leaves," riti- "stream; motion, course;" L. rivus "stream, brook;" Old Church Slavic rēka "river;" Rus. reka "river;" Goth. rinnan "run, flow," rinno "brook;" O.E. ridh "stream." šenâsi, → -logy.

morphology-density relation
  بازانش ِ ریخت-چگالی   
bâzâneš-e rixt-cagâli

Fr.: relation morphologie-densité   

An observationally determined relationship between the → morphological classification of galaxies and the → environments in which they are located. Specifically, the morphology-density relation indicates that early-type galaxies (→ ETG) are preferentially located in high density environments, whereas late-type galaxies (→ LTG) are preferentially found in low density environments. Hence, spiral galaxies are rare in the high densities of clusters and are common in the lower density group environments. Early-type galaxies, on the other hand, are common in clusters and are rarely found in isolation.

morphology; → density; → relation.

nanotechnology
  نانو-تشنیک‌شناسی   
nâno-tašnik-šenâsi

Fr.: nanotechnologie   

The science and technology of producing and exploiting structures and systems at dimensions of roughly 1 to 100 → nanometers, that is those of single atoms and molecules. Materials with such minute structures possess mechanical, optical, chemical, magnetic or electronic properties not found in ordinary materials.

nano-; → technology.

Napierian logarithm
  لگاریتم ِ ناپیری   
logâritm-e Napieri (#)

Fr.: logarithme népérien   

Same as the → natural logarithm.

After John Laird Napier (1550-1617), the Scottish mathematician who invented logarithm; → logarithm.

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