early AGB phase
fâz-e AGB-ye âqâzin
Fr.: phase initiale de l'AGB
A fairly long-lived step in the evolution of → low-mass and → intermediate-mass stars when helium burning shifts from the center to a shell around the core. At this phase the stellar luminosity is provided almost entirely by → helium shell burning. The He-shell burning generally adds mass to the growing carbon/oxygen core, resulting in → degenerate matter due to its increasing density.
binâbnegâr-e narde-yi (#)
Fr.: spectrographe à échelle
A spectrograph that uses an echelle grating to disperse the light.
The space around a star in which a planet would experience external conditions that are not incompatible with the existence of life.
Fr.: trompe d'éléphant
An elongated structure of → interstellar dust and gas which absorbs the radiation from background stars in an → H II region. These structures are the denser remnants of → molecular clouds from which → massive stars are formed. Elephant trunks are eventually dissipated by the action of the → ionizing radiation and → stellar wind of the associated massive stars. A remarkable example of these structures is displayed by the → HST image of the → Eagle Nebula as → pillars of obscuring matter protruding from the interior wall of a dark molecular cloud. Some → Bok globules may represent the remaining densest fragments of elephant trunks.
M.E. elephant, from O.Fr. olifant, from L. elephantus, from Gk. elephas "elephant, ivory," probably from a non-I.E. language, likely via Phoenician; trunk, from M.E. trunke, O.Fr. tronc, from L. truncus "stem, trunk, stump."
Xortum "the proboscis of an elephant," loanword from Ar. xartum; fil, pil "elephant," from Mid.Pers. pil "elephant;" O.Pers. piru- "ivory."
Elephant's Trunk Nebula
miq-e xortum-e fil
Fr.: Nébuleuse de la trompe d'éléphant
An elongated dark structure of gas and dust in the → H II region IC 1396. It spans about 5 degrees on the sky in the constellation → Cepheus, about 2400 → light-years from the Earth. The Elephant Trunk Nebula is believed to be site of star formation, containing several very young stars. It is an example of → elephant trunks associated with star forming regions.
Fr.: accentuation, accent
Special stress laid upon, or importance attached to (Dictionary.com).
From L. emphasis, from Gk. emphasis "significance, implied meaning," from emphainein "to show, indicate," from en "in" + phainein "to show." It developed a sense of "extra stress" laid on a word or words to make the significance clear, or to show their importance.
Barâvaž, present stem of barâvažidan, literally "to speak loudly," from bar- "on, upon, up," → over-, + âvaž variant of âvâz "voice, sound, noise, clamour," cf. Sariqoli awuj "voice, sound," Wakhi awôγ "voice, sound," related to vâž, → word.
Fr.: appuyer sur, insister sur, souligner
To give → emphasis to; lay stress upon; stress (Dictionary.com).
Fr.: énergique, catégorique
1) Uttered, or to be uttered, with emphasis; strongly expressive.
From Gk. emphatikos, variant of emphantikos, from emphainein, → emphasis.
Barâvaži, from barâvaž + -i adj. suffix.
Fr.: graphe vide
A table of computed positions occupied by a celestial body over successive intervals of time such as daily; plural ephemerides.
From L. ephemeris "day book, diary," from Gk. ephemeris "diary, account book," from ephemeros "short-lived, lasting but a day," from → epi "on, upon" + hemerai, dative of hemera "day."
Ruzij, from ruz, → day + zij "astronomical table," from Mid.Pers. zig "astronomical table," originally "string," since the lines of a table were compared to strings used on a weaver's instrument, variant zih, meaning "cord, string" (Modern Persian zeh "cord, string"); Av. jiiā- "bow-string;" cf. Skt. jiyā- "bow-string;" PIE base *gwhi- "thread, tendon" (from which derive also Gk. bios "bow;" L. filum "thread;" Russ. žca "thread").
Fr.: jour des éphémérides
86,400 → ephemeris seconds.
Fr.: méridien des éphémérides
A fictitious meridian that rotates independently of the Earth at the uniform rate implicitly defined by → Terrestrial Dynamical Time (TDT).
Fr.: seconde des éphémérides
The length of a tropical second (1/31,556,925.97474 of the tropical year) on 1900 January 0.5 → ephemeris time.
ephemeris time (ET)
Fr.: Temps des éphémérides
The uniform time-scale used as the independent variable
to calculate the orbits in the solar system prior to 1984. Ephemeris Time was adopted in
1960 to deal with irregularities in the → Earth's rotation
that had been found to affect the
course of mean solar time. The definition of Ephemeris Time is based on Newcomb's analytical
theory of the Earth's motion around the Sun (Newcomb 1898), according to which the geometric
mean longitude of the Sun with respect to the Earth-Moon barycenter is expressed by:
Fr.: transit au méridien des éphémérides
The passage of a celestial body or point across the → ephemeris meridian.
A → morphism f : Y → X if, for any two morphisms u,v : X → Z, u f = v f implies u = v.
The region between the → event horizon and the → stationary limit of a rotating → Kerr black hole. It is possible for a particle falling inside the ergosphere to break into two parts, one of which will fall into the black hole and the other will come out.
Fr.: sphères d'Eudoxe
An inoffensive word or phrase substituted for one considered offensive or hurtful, especially one concerned with religion, sex, death, or excreta (TheFreeDictionary.com).
From Gk. euphemismos, from euphemizein "speak with fair words, use words of good omen," from → eu- "well," + pheme "speech, voice, talk," from phanai "to speak," ultimately from PIE *bha- "to speak, tell, say;" cf. Skt. bhanati "speaks;" L. fari "to say," fabula "tale, story," fama "talk, rumor, report; reputation;" Armenian ban, bay "word, term."