An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 74 Search : angle
critical angle
  زاویه‌ی ِ پرژنی   
zâviyeh-ye paržani

Fr.: 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 vâcaft

Fr.: 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 dodimi

Fr.: 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 našib

Fr.: 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 râstâ

Fr.: 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-picidan

Fr.: 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-pici

Fr.: emmêlment, intrication   

The act of entangling. The state of being entangled.

Verbal noun of → entangle; → -ment.

epoch angle
  زاویه‌ی ِ زیمه   
zâviye-ye zimé

Fr.: 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 , → three, pahlu, → side, barâbar, → equal.

exterior angle
  زاویه‌ی ِ برونی   
zâviye-ye boruni

Fr.: angle extérieur   

1) Any of the four angles that do not include a region of the space between two lines intersected by a third straight line (→ transversal).
2) The angle between any side and an extension of an adjacent side of a polygon.

exterior; → angle.

face angle
  زاویه‌ی ِ دیمی، دیم-زاویه   
zâviye-ye dimi, dim-zâviyé

Fr.:   

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 fotâd

Fr.: angle d'incidence   

Same as → angle of incidence.

incidence; → angle.

initial phase angle
  زاویه‌ی ِ فاز ِ آغازین   
zâviye-ye fâz-e âqâzin

Fr.: 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 davešté

Fr.: angle inscrit   

An angle whose vertex lies on a circle and whose sides are chords of the circle.

Inscribed p.p. of → inscribe; → angle.

interior angle
  زاویه‌ی ِ درونی   
zâviye-ye daruni

Fr.: angle intérieur   

1) Any of the four angles formed between two straight lines intersected by a third straight line (→ transversal).
2) The angle between two adjacent sides of a polygon that lies inside the polygon.

interior; → angle.

isokinetic angle
  زاویه‌ی ِ ایزوجنبشی   
zâviye-ye izojonbeši

Fr.: 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 izobirâh

Fr.: 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.

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