ADaptive Optics Near Infrared System (ADONIS)
Fr.: ADaptive Optics Near Infrared System (ADONIS)
An → adaptive optics instrument used on the → European Southern Observatory (ESO) 3.6-m telescope at La Silla. It was an upgraded version of COME-ON-PLUS, the → Very Large Telescope (VLT) adaptive optics prototype. It had 52 → actuators and performed corrections of the mirror 200 times per second. The reference → wavefront was sensed in the → visible. The observation was done in the → near-infrared (1-5 μm).
alkaline earth metal
felez-e qalyâyi-ye xâki (#)
Fr.: terre alcaline
Any of the metallic chemical elements belonging to group 2 of the → periodic table; i.e. → beryllium, → magnesium, → calcium, → strontium, → barium, and → radium. They are not found free in the nature because they are highly reactive.
Fr.: année anomalistique
Anomalistic from → anomaly.
Pirâhuri from pirâhur, → perihelion.
Fr.: année besselienne
The period taken for the right ascension of the mean Sun to increase by 24 hours. The starting point is when the mean Sun's longitude is 280°, corresponding roughly to January 1. It is virtually the same as the tropical year.
sâl-e gâhšomâri, ~ gâhmâri
Fr.: année du calendrier
The time interval between the new year's day in a given calendar system and the day before the following new year's day. In the Gregorian system the calendar year begins on January 1 and ends on December 31. In the Iranian calendar it begins on Farvardin 1, the day closest to the spring equinox and ends on Esfand 29 or 30.
Fr.: disque circumnucléaire
A thick disk of gas and dust clouds surrounding the → Galactic Center up to about 20 → light-years. The disk is very clumpy; the → clumps have densities of several 105 particles/cm3, radii of about 0.3 light-years, and gas temperatures above 100 K. The hydrogen mass of the disk is a few 104 → solar masses. Such circumnuclear disks are present also in other galaxies.
1) Free from darkness, obscurity, or cloudiness.
M.E. clere, from O.Fr. cler, from L. clarus "clear, bright, distinct."
Runé, from Kurd. (Sorani) rûn "bright, clear," rûn kirdin "to explain," variant of rowšan, → bright.
Fr.: nuit claire
A night sky without clouds, mist, or haze, atmospheric dust particles, and without city lights in which a sixth magnitude star is visible by naked-eye.
Lying on the same straight line. Collinear points are a set of points on the same line.
Fr.: forces collinéaires
A system of two or more forces that lie along the same → line of action.
A mathematical property where all points lying on a line initially still lie on a line after transformation.
Fr.: cisaillement cosmique, ~ gravitationnel
Consisting of, represented by, or bound by curved lines. → rectilinear.
The vertebrate organ of hearing, which is also responsible for maintaining equilibrium. It is usually composed of three parts: the outer ear, middle ear, and inner ear.
M.E. ere, O.E. eare "ear" (O.N. eyra, Dan. øre, M.Du. ore, Du. oor, O.H.G. ora, Ger. Ohr); cf. Gk. aus; L. auris; Av. usi "both ears;" Lith. ausis; O.C.S. ucho; O.Ir. au; PIE *ous-.
Guš "ear" (gušidan "to hear," niyušidan "to listen"); Mid.Pers. gôš "ear," gôšidan "to hear, listen;" O.Pers. gauša-; Av. gaoša- "ear," gaoš- "to hear;" cf. Skt. ghosa- "noise, tumult," ghus- "to sound, cry or proclaim aloud;" PIE *ghous-.
Fr.: précoce; jeune
Occurring at or near the beginning of a period of time, process, or sequence of events.
M.E. erlich (adj.), erliche (adv.); O.E. ærlice, from ær "soon, ere" (from P.Gmc. *airiz, from PIE *āier- "day, morning," cf. Av. ayar- "day, day time," ayarə.drājah- "duration of one day," ayarə.bara- "day's ride," Mid/Mod.Pers. parēr "the day before yesterday," from *parā.ayer- "the day before") + -lice "-ly," adverbial suffix.
Âqâzin adj. of âqâz "beginning," from Proto-Iranian *āgaHz-, from prefix ā- + *gaHz- "to run, start," cf. Sogdian āγāz "beginning, start" (Cheung 2007).
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.
early solar system
râžmân-e xoršidi-ye âqâzin
Fr.: système solaire primordial
A period in the evolution of the → solar system when the planets and satellites were in the process of formation.
early spectral class star
setâré bâ rade-ye binâbi-ye âqâzin
Fr.: étoile de type spectral précoce
giti-ye âqâzin (#)
Fr.: Univers jeune