# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 72 Search : angle
 obtuse angle   زاویه‌ی ِ باز   zâviye-ye bâz (#)Fr.: angle obtus   An angle whose measure is greater than 90° and less than 180°.Obtuse, from M.Fr. obtus (fem. obtuse), from L. obtusus "blunted, dull," p.p. of obtundere "to beat against, make dull," from ob "against" + tundere "to beat," from PIE *(s)tud- "to beat, strike, push, thrust;" → angle.Zâviyé, → angle; bâz "open," from Mid.Pers. abâz-, apâc-, O.Pers. apa- [pref.] "away, from;" Av. apa- [pref.] "away, from," apaš [adv.] "toward the back;" cf. Skt. ápāñc "situated behind." parallactic angle   زاویه‌ی ِ دیدگشتی   zâviye-ye didgaštiFr.: angle parallactique   Of an object in the sky, the angle between the → celestial pole, the object, and the → zenith. Since parallactic angle describes the orientation on the sky of the object for a particular observer, it can be an important quantity in some observations.→ parallactic; → angle. parallax angle   زاویه‌ی ِ دیدگشت   zâviye-ye didgaštFr.: angle de parallaxe   The angular displacement associated with → parallax.→ parallax; → angle. Pascal's triangle   سه‌بر ِ پاسکال   sebar-e PascalFr.: triangle de Pascal   An array of numbers in the shape of a triangle, having a 1 at the top and also at the ends of each row. Each number is obtained by summing the two adjacent numbers to it in the preceding row. Each row is a set of → binomial coefficients. In the expansion of (x + y)n, the coefficients of x and y are given by the n-th row of Pascal's traingle.→ pascal; → triangle. phase angle   زاویه‌ی ِ فاز   zâviye-ye fâz (#)Fr.: angle de phase   1) Physics: Of a → periodic wave, the number of suitable units of angular measure between a point on the wave and a reference point. 2) Astro.: For an object in the solar system, the angle "Sun-object-Earth" that is, the angle between the Sun and the observer as seen from the given object. It is 0° when the object is fully illuminated, 90° when the object is half-illuminated (like the Moon at first quarter and last quarter), and 180° when the object is between Earth and the Sun. 3) More generally, the angle between star light incident onto a related revolving object and the light reflected from the object to the observer (Earth).→ phase; → angle. polarization angle   زاویه‌ی ِ قطبش   zâviye-ye qotbeš (#)Fr.: angle de polarisation   Same as → polarizing angle and → Brewster angle.→ polarization; → angle. polarizing angle   زاویه‌ی ِ قطبش   zâviye-ye qotbeš (#)Fr.: angle de polarisation   The angle of → incidence for which the reflected light is completely polarized. Also called the → Brewster angle and → polarization angle. See also → Brewster's law.Polarizing, adj. of → polarize; → angle. position angle   زاویه‌ی ِ نهش   zâviye-ye nehešFr.: angle de position   The convention for measuring angles on the sky in astronomy (Abbreviated as PA). It is the direction of an imaginary arrow in the sky, measured from north through east: 0° = north, 90° = east, 180° = south, and so on to 359° and back to 0°. Applied to a binary system it is the direction of a secondary body or feature from a primary, measured in the system. .→ position; → angle. prism angle   زاویه‌ی ِ منشور   zâviye-ye manšurFr.: angle de prisme   The angle between the faces on which light is incident and from which it emerges.→ prism; → angle. quadrangle   چهارگوشه، چارگوش   cahârgušé, cârgušFr.: quadrilatère   A two-dimensional figure that consists of four points connected by straight lines. Same as → tetragon; see also → quadrilateral.L.L. quadrangulum, noun use of neuter of L. quadrangulus, quadriangulus "four-cornered," from quadr- variant of quadri- before a vowel "four," akin to quattuor, → four, cognate with Pers. cahâr, as below; → angle.Cahârgušé, cârguš "four-cornered," from cahâr, câr "four," cognate with L. quattuor, → four, + gušé, guš "corner, angle;" Mid.Pers. gôšak "corner." quantum entanglement   هم‌گورش ِ کو‌آنتومی، هم‌پیچی ِ ~   ham-gureš-e kuântomi, ham-pici-ye ~Fr.: emmêlement quantique, intrication ~   A quantum → phenomenon that occurs when two or more particles (→ photons or → atomic particles) that have a common origin remain linked together when they travel apart. A measurement of one of the particles determines not only its → quantum state but the quantum state of the other particle as well. A change in one is instantly reflected in the other. See also → EPT paradox.→ quantum; → entanglement. rainbow angle   زاویه‌ی ِ رنگین‌کمان   zâviye-ye rangin-kamânFr.: angle d'arc-en-ciel   The → obtuse angle between sunlight and the → line of sight. Rainbow angle = 180° minus → scattering angle. For the → primary rainbow it is 138°, and for the → secondary rainbow 130°.→ rainbow; → angle. rectangle   راستگوشه   râstgušé (#)Fr.: rectangle   A → quadrilateral all of whose angles are → right angles.M.Fr. rectangle, from M.L. rectangulum "a triangle having a right angle," from rect-, combining form of rectus→ right + angulum, → angle.Râstgušé, from râst, → right, + gušé "corner, angle;" Mid.Pers. gôšak "corner." Reuleaux triangle   سه‌بر ِ رولو   sebar-e ReuleauxFr.: triangle de Reuleaux   A shape of constant width created using an equilateral triangle and three similar circles. The equilateral triangle lies in the first circle with a vertex coinciding with the center of the circle and the sides equal to the circle radius. The centers of the two other circles are located at the two other vertices. The Reuleaux triangle is the intersection of the three circles.Named after Franz Reuleaux (1829-1905), a German engineer, specialist of analysis and design of mechines; → triangle. right angle   زاویه‌ی ِ راست   zâviye-ye râstFr.: angle droit   An angle of 90°.→ right; → angle. right triangle   سه‌بر ِ راست   sebar-e râst (#)Fr.: triangle droit   A triangle one of whose angles is a → right angle.→ right; → triangle. ring opening angle   زاویه‌ی ِ گشایش ِ حلقه   zâviye-ye gošâyeš-e halqéFr.: angle d'ouverture des anneaux   Of → Saturn, the angle between the line of sight and the ring plane. Also known as elevation angle, tilt angle.→ ring; → open; → angle.Zâviyé, → angle; gošâyeš "opening," verbal noun from gošudan, gošâdan "to open up, loose, let free;" gošâd "opened; ample, broad;" Mid.Pers. wišâdan "to let free;" Khotanese hīyā "bound;" O.Pers. višta "untied, loosened," vištāspa- "with loosened horses" (personal name); Av. višta "untied," ā-hišāiiā "holds fettered," hita- "fastened, tied on, put to;" cf. Skt. sā- "to bind, fasten, fetter," sitá- "bound," ví-sita- "untied;" halqé, → ring. scalene triangle   سه‌بر ِ ناجور-پهلو   sebar-e nâjur-pahluFr.: triangle scalène   A triangle no two sides of which are equal.From L.L. scalenus, from Gk. skalenos "uneven, unequal, rough," from skallein "chop, hoe," related to skolios "crooked," from PIE base *(s)qel- "crooked, curved, bent;" → triangle.Sebar, → triangle; nâjur-pahlu "dissimilar sides," from nâjur "dissimilar, ill-matched" + pahlu "side, flank" (Mid.Pers. pahlug "side, rib," Av. pərəsu- "rib," Ossetic fars "side, flank," cf. Skt. párśu- "rib," Lith. piršys (pl.) "horse breast"). scattering angle   زاویه‌ی ِ پراکنش   zâvie-ye parâkanešFr.: angle de diffusion   The angle between the → incident radiation on a → particle (such as a water droplet in a rainbow) and the scattered radiation (such as the light ray leaving the droplet). Scattering angle is a function of → impact parameter. In other words, The angle along which the change of direction has taken place, irrespective whether radiation is scattered by particles or reflected (refracted) by a surface.→ scattering; → angle. shallow angle   زاویه‌ی ِ نژل   zâviye-ye nažalFr.: angle faible   Low angle, → grazing incidence.→ shallow; → angle.