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
 critical angle   زاویه‌ی ِ پرژنی   zâviyeh-ye paržaniFr.: angle critique   Angle of incidence of light proceeding from a denser medium toward a thinner, at which grazing refraction occurs (angle of refraction 90°).→ critical; → angle. deflection angle   زاویه‌ی ِ واچفت   zâviye-ye vâcaftFr.: angle de déflexion   1) The angle by which a light ray is curved by the gravitational field of a massive body. Einstein's general relativity predicts that a light ray which tangentially grazes the surface of the Sun is deflected by 1''.7. This result was confirmed in 1919 when the apparent angular shift of stars close to the limb of the Sun was measured during a total solar eclipse. 2) In a cathode-ray tube, the angle through which the beam is bent, vertically, horizontally, or diagonally.→ deflection; → angle. dihedral angle   زاویه‌ی ِ دودیمی   zâviye-ye dodimiFr.: angle dièdre   An angle formed by two planes meeting along a common line. Compare with → face angle.→ angle; → dihedral. dip angle   زاویه‌ی ِ نشیب   zâviye-ye našibFr.: angle d'inclinaison   The angular difference between the → visible horizon and the → true horizon. Same as → dip of the horizon.→ dip; → angle. direction angle   زاویه‌ی ِ راستا   zâviye-ye râstâFr.: angle de direction   An angle made by a given vector and a coordinate axis. The angle between the North and a chosen direction.→ direct; → angle. entangle   هم‌گوریدن، هم‌پیچیدن   ham-guridan, ham-picidanFr.: emmêler   To wrap or twist together; to intertwine.From → en- "in," + tangle, from M.E. tangilen, tagilen "to entangle."Hamgureš, from ham- "together," → com-, + guridan "to become tangled, as threads or hairs, entwine," probably related to greh "knot," → node. Hampicidan, from ham- + picidan "to twist, entwine, coil." entanglement   هم‌گورش، هم‌پیچی   ham-gureš, ham-piciFr.: emmêlment, intrication   The act of entangling. The state of being entangled.Verbal noun of → entangle; → -ment. epoch angle   زاویه‌ی ِ زیمه   zâviye-ye ziméFr.: angle de phase initial   Same as the → initial phase angle.→ epoch; → angle. equilateral triangle   سه‌بر ِ سه-پهلو-برابر   sebar-e sé-pahlu-barâbar (#)Fr.: triangle équilatéral   A triangle having three equal sides.→ equi-, → lateral, → triangle.Sé-pahlu-barâbar, from sé, → three, pahlu, → side, barâbar, → equal. face angle   زاویه‌ی ِ دیمی، دیم-زاویه   zâviye-ye dimi, dim-zâviyéFr.:   An angle formed by any two adjacent edges of a → polyhedron, in contrast to a → dihedral angle.→ face; → angle. grating angle   زاویه‌ی ِ توری   zâviye-ye turi (#)Fr.: angle de réseau   The angle between the incident optical beam and the normal to the grating. It is the angle to which the grating must be set to place the desired wavelength at the center of the detector.→ grating; → angle. hour angle   زاویه‌ی ِ ساعتی   zâviye-ye sâati (#)Fr.: angle horaire   A telescope based coordinate specifying the angle, in the equatorial plane, from the meridian to a plane containing the celestial object and the north and south celestial poles.→ hour; → angle. incidence angle   زاویه‌ی ِ فتاد   zâviye-ye fotâdFr.: angle d'incidence   Same as → angle of incidence.→ incidence; → angle. initial phase angle   زاویه‌ی ِ فاز ِ آغازین   zâviye-ye fâz-e âqâzinFr.: angle de phase initial   The value of the phase corresponding to the origin of time. Same as the → epoch angle.→ initial; → phase; → angle. inscribed angle   زاویه‌ی ِ دروِشته   zâviye-ye daveštéFr.: angle inscrit   An angle whose vertex lies on a circle and whose sides are chords of the circle.Inscribed p.p. of → inscribe; → angle. isokinetic angle   زاویه‌ی ِ ایزوجنبشی   zâviye-ye izojonbešiFr.: angle isocinétique   Adaptive optics: The angle over which wavefront phases become de-correlated by 1 radian rms due to → tip-tilt alone. It is defined analogously to the → isoplanatic angle.→ iso-; → kinetic; → angle. isoplanatic angle   زاویه‌ی ِ ایزوبیراه   zâviye-ye izobirâhFr.: angle isoplanatique   The angle in which the → point spread function of the atmosphere/telescope system is space invariant. Because of the presence of → turbulence in high layers of the atmosphere, this angle is extremely small, often only a few seconds of arc at visible wavelengths. See also → aplanatism.→ isoplanatic; → angle. isosceles triangle   سه‌بر ِ دو-پهلو-برابر   sebar-e do-pahlu-barâbar (#)Fr.: triangle équilatéral   A triangle having two sides equal.From L.L. isosceles, from Gk. isoskeles "with equal legs; that can be divided into two equal parts," from isos "equal, identical," → iso-, + skelos "leg."Sebar, → triangle, do-pahlu-baraabar, from do, → two, pahlu, → side, barâbar, → equal. Mach angle   زاویه‌ی ِ ماخ   zâviye-ye MachFr.: angle de Mach   Half of the vertex angle of the → Mach cone generated by a body in → supersonic flight. It is given by sin μ = (a/v), where a is the speed of the sound waves and v the velocity of the object. In terms of Mach number: μ = asin (1/M). The Mach angle diminishes with the object velocity. For M = 1 it is 90°, for M = 2, it is 30°, and for M = 5, its is 11.5°.→ Mach number; → angle. meridian angle   زاویه‌ی ِ نیمروزان   zâviye-ye nimruzânFr.: angle horaire   Same as hour angle.→ meridian; → angle.