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Fr.: angle d'aberration
The angle tilt required by the → stellar aberration phenomenon in order that a moving telescope points directly to a star.
Fr.: constante d'aberration
Same as → constant of aberration.
aberration of light
Fr.: aberration de la lumière
aberration of starlight
birâheš-e nur-e setâré
Fr.: aberration de la lumière d'étoile
An apparent displacement in the observed position of a star. It is a result of the finite speed of light combined with the relative motion of the Earth through space. Suppose that you walk through a vertically falling rain with an umbrella over your head. The faster you walk, the further you must lower the umbrella in front of yourself to prevent the rain from striking your face. For starlight to enter a telescope, a similar phenomenon must occur, because the Earth is in motion. The telescope must be tilted in the direction of motion by an angle: tan θ =(v/c), where v the Earth velocity and c the speed of light. The aberration of starlight was discovered by the English astronomer James Bradley (1693-1762) in 1729 by observing → Gamma Draconis. The tilt angle is θ = 20''.50, from which the Earth's orbital speed, 29.80 km s-1, can be deduced, using the above equation. See also → annual aberration; → diurnal aberration; → secular aberration. → Special relativity modifies the classical formula for aberration, predicting results which differ substantially from those of classical physics for objects moving at a substantial fraction of the speed of light; → relativistic aberration.
Fr.: orbite d'aberration
The apparent path described by a star on the → celestial sphere due → annual aberration. A star at the → ecliptic pole is seen to move around a circle of angular radius about 20".50, once a year. A star on the → ecliptic oscillates to and fro along a line of angular half-length 20".50. At an intermediate → celestial latitude, β, the aberration orbit is an ellipse, with semi-major axis 20".50 and semi-minor axis (20".50) sin β.
Of or pertaining to → aberration.
aberrational day number
šomâre-ye ruz-e birâheši
Fr.: nombre de jours d'aberration
A → Besselian day number denoted by C or D.
Fr.: ellipse d'aberration
L. ablatio, ablation, from ablatus, from ab- "away" + latus "carried."
Farsâb from far-, prefix denoting "abundance, excess" + sâb present stem of sâbidan "to rub, wear out," variants sâyidan, pasâvidan "to touch," Khotanese sauy- "to rub," Sogdian ps'w- "to touch," Proto-Iranian *sau- "to rub."
M.L. anormalis, blend of L.L. abnormis "deviating from a rule," from ab- "off, away from" + L. norma "rule."
Bihanjâr, from Pers. bi- "without" + Pers. hanjâr "rule, habit, law, staright road."
1) To terminate a procedure before it has finished naturally.
From L. abortus, p.p. of aboriri "to miscarry" (a child) from → ab- "from, away, off," + oriri "to rise, be born;" cf. Pers. rasidan "to attain; to arrive" (Mid.Pers. rasidan "to arrive, to mature;" O.Pers./Av. rasa- present stem of ar- "to move, go or come toward;" Skt. ar-, rcchati "reaches;" Gk. erkhomai "to go, to reach").
Fagânidan, from fagâné "abortion", related to fegandan, fekandan, afkandan "to throw, to cast away;" Mid.Pers. abgandan "to throw;" O.Pers. avakan- "to throw, place on," from Proto-Iranian *kan- "to throw, place, put."
The stopping of a process; a result of such termination.
Verbal noun of → abort.
In plane Cartesian coordinates, the distance of any point from the vertical axis (y-axis). The distance from the horizontal axis (x-axis) is called → ordinate.
From L abscissa (linea) "(a line) cut off," from p.p. of abscindere "to cut off," from → ab- "off, away" + scindere "to cut." The word abscissa was first used by Stefano degli Angeli (1623-1697), a professor of mathematics in Rome.
Pirâ, present stem of pirâstan "to prune, clip, trim; to adorn, embellish (especially by cutting, clipping, or taking away)," related to ârâstan "to arrange, adorn," from Mid.Pers. payrâstan, patrâstan "to arrange, adorn," ultimately from Proto-Iranian *pati-rad-. The first component *pati- "to, toward, near to, against;" cf. Mid.Pers. pât-, from O.Pers. paity "against, back, opposite to, toward, face to face, in front of;" Av. paiti; Skt. práti "toward, against, again, back, in return, opposite;" Pali pati-; Gk. proti, pros "face to face with, toward, in addition to, near;" PIE *proti. The second component *rad- "to direct, to prepare;" cf. O.Pers. rād- "to prepare," rās- "to be right, straight, true," rāsta- "straight, true" (Mod.Pers. râst "straight, true"); Av. rāz- "to direct, put in line, set," razan- "order;" Gk. oregein "to stretch out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Skt. rji- "to make straight or right, arrange, decorate;" PIE base *reg- "move in a straight line."
1) State of being away or not being present.
Noun from → absent.
1) Not in a certain place at a given time; away, missing (opposed to present).
Fr.: absent, absentéiste
A person who is absent, especially from work or school (Dictionary.com).
From → absent + -ee a suffix forming nouns that denote a person who is the object or beneficiary of the act specified by the verb, from Fr. -é, ending of p.p.s used as nouns.
Voluntary non attendance at work, without valid reason. Absenteeism means either habitual evasion of work, or willful absence as in a strike action. It does not include involuntary or occasional absence due to valid causes, or reasons beyond one's control, such as accidents or sickness (BusinessDictionary.com).
1) General: Not limited by restrictions or exceptions; perfect in quality
or nature; unqualified in extent or degree; complete.
From M.Fr. absolut, from L. absolutus "unrestricted," p.p. of absolvere "to set free," from ab- "away" + solvere "to loosen," from PIE *leu-. → solve.
Avast from negation prefix → a- + vast, variant of bast, basté "tied, bound," from Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie," Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind," cf. Ger. binden, E. bind, → band.
Fr.: accélération absolue
For a body that moves with respect to a rotating → reference frame, the vector sum of the observed acceleration, the → Coriolis acceleration, and the → centrifugal acceleration. See also the → Coriolis theorem.
Fr.: datation absolue
Any method of measuring the age of an event or object in years. For example, in geology, this method can, unlike → relative dating, give us the age of a rock or fossil in x number of years. The most widely used and accepted method of absolute dating is → radioactive dating. See also: → radiocarbon dating, → radiometric dating.