An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 23 Search : right
bright
  درخشان، روشن   
deraxšân, rowšan

Fr.: brillant   

Giving out or reflecting much light, shining.

O.E. bryht, from beorht "bright, splendid," from P.Gmc. *berkhiaz, from PIE base *bhereg- "to gleam, white" (cf. Av. brāz- "to shine, gleam, flash, radiate," Skt. bhrajate "shines, glitters," Mod.Pers. balk, warq, barx, barq "flash, flame, light," barâz "beauty, grace, elegance," barâzidan "to render good, beautiful," Lith. breksta "to dawn," Welsh berth "bright, beautiful," L. flagrare "to blaze"). → electricity.

Deraxšân and rowšan both from M.P. rôc, O.Pers. raucah-, Av. raocah- "light, luminous; daylight;" cf. Skt roka- "brightness, light", cognate with Gk. leukos "white, clear", L. lux "light" (also lumen, luna), PIE *leuk- "light, brightness". The Mod.Pers. words ruz "day," foruq "light", and afruxtan "to light, kindle" also belong to this family, as well as the E. light, Ger. Licht, and Fr. lumière.

bright giant
  غول ِ تابناک   
qul-e tâbnâk

Fr.: géante lumineuse   

An → evolved star which is more → luminous than normal → giant stars (→ luminosity class III) and between ordinary giants and → supergiants (class I). It is denoted by the symbol II. Examples are → Canopus and → Adhara.

bright; → giant.

bright nebula
  میغ ِ روشن، ~ درخشان   
miq-e rowšan, ~ deraxšân

Fr.: nébuleuse brillante   

In contrast to a → dark nebula, a bright cloud of interstellar gas and dust. The term designates both emission nebulae and reflection nebulae.

bright; → nebula.

brightening
  روشنش   
rowšaneš

Fr.: embrillancement   

The act or process of becoming bright or brighter. → limb brightening, → gravity brightening

Verbal noun of brighten, from → bright.

brightness
  درخشندگی   
deraxšandegi (#)

Fr.: brillance   

General:The state or quality of being bright.
Astronomy:The amount of light or other radiation received from a celestial object. It depends on the intrinsic brightness of the object, its distance and the amount of interstellar extinction. → luminosity.

bright + → -ness.

Deraxšandegi, from deraxš, present stem of deraxšidan "to shine," → bright, + -andé adjective suffix + -gi noun suffix.

brightness distribution
  واباژش ِ درخشندگی   
vâbâžeš-e deraxšandegi

Fr.: distribution de brillance   

A statistical distribution of the brightness of an astronomical extended object.

brightness; → distribution.

Vâbâžeš, → distribution; deraxšandegi, → brightness.

brightness temperature
  دما‌ی ِ درخشندگی   
damâ-ye deraxšandegi

Fr.: température de brillance   

In radio astronomy, the temperature of a source calculated on the assumption that it is a blackbody emitting radiation of the observed intensity at a given wavelength. → antenna temperature.

brightness; → temperature.

general precession in right ascension
  پیشایان ِ هروین ِ راست‌افراز   
pišâyân-e harvin-e râst afrâz

Fr.: précession générale en ascension droite   

The secular motion of the → equinox along the → celestial equator.

general; → precession; → right ascension.

gravity brightening
  روشنش ِ گرانشی   
rowšaneš-e gerâneši

Fr.: embrillancement gravitationnel   

gravity darkening.

gravity; → brightening.

intrinsic brightness
  درخشندگی ِ درونگین   
deraxšandegi-ye darungin

Fr.: brillance intrinsèque   

The brightness of an object, such as a star, that is not affected by interstellar absorption and independent of distance.

intrinsic; → brightness.

limb brightening
  روشنش ِ لبه   
rowšaneš-e labé

Fr.: embrillancement centre-bord   

An observed increase in the intensity of radio, extreme ultraviolet, or X-radiation from the Sun from its center to its limb.

limb; → brightening.

low surface brightness galaxy (LSBG)
  کهکشان با درخشندگی ِ رویه‌ای ِ کم   
kahkešân bâ deraxšandegi-ye ruye-yi-ye kam

Fr.: galaxie à faible brillance de surface   

A member of a particularly faint population of galaxies with a central → surface brightness below the brightness of the background sky. The central regions of many of them resemble a → dwarf galaxy, but most of the mass is contained in a large gaseous disk of low density that is observable only with long-exposure optical images or at radio wavelengths. Some are as massive as a large → spiral galaxy, for example Malin 1. The proportion of LSBGs relative to normal galaxies is unknown. They may however represent a significant fraction of mass in the Universe. LSBGs are thought to be primitive systems because they have total masses similar to normal galaxies, but have typically converted less than 10% of their gas into stars. Spiral LSBGs do not obey → Freeman's law.

low; → surface; → brightness; → galaxy.

nutation in right ascension
  کلتاو ِ راست‌افراز   
kaltâv-e râst-afrâz

Fr.: nutation en ascension droite   

Same as → equation of the equinoxes.

nutation; → right ascension.

Orion Bright Bar
  میله‌ی ِ درخشان ِ شکارگر، ~ ~ اُریون   
mile-ye deraxšân-e Šekârgar, ~ ~ Orion

Fr.: barre brillante d'Orion   

A prominent emission ridge in the → Orion Nebula located approximately 2' southeast of the → Trapezium cluster. Various observations have suggested that it is an escarpment in the main → ionization front of the Nebula seen almost edge-on. The Orion Bar is one of the nearest and best-studied → photodissociation regions.

Orion; → bright; → bar.

right
  ۱) راست؛ ۲) درست؛ ۳) راشن   
1) râst (#); 2) dorost; 3) râšan

Fr.: droit   

1a) Straight, free from curves, angles, or irregularities. → right ascension.
1b) Opposite of → left. → right-hand rule, → right-hand screw rule.
2) In accordance with fact, reason, or truth; correct or true.
3) Something that a person is or should be morally or legally allowed to have, get, or do (Merriam-Webster).

M.E.; O.E. reht, riht; cf. O.H.G. reht, Ger. recht, O.N. rettr, Goth. raihts; P.Gmc. *rekhtaz, cognate with Pers. râst, as below.

1) Râst "right, true; just, upright, straight;" Mid.Pers. râst "true, straight, direct;" Soghdian rəšt "right;" O.Pers. rāsta- "straight, true," rās- "to be right, straight, true;" Av. rāz- "to direct, put in line, set," razan- "order;" related to Mid.Pers. rây-, râyênitan "to arrange;" Mod.Pers. raj "line, row," variants raž, rak, râk, rezg (Lori), radé, râdé "line, rule, row," rasté, râsté "row, a market with regular ranges of shops;" ris, risé "straight;" cf. Skt. raj- "to direct, stretch," rjuyant- "walking straight;" Gk. orektos "stretched out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" PIE base *reg- "move in a straight line," hence, "to direct, rule;"
2) Dorost "correct, whole, complete, healthy," → integral.
3) Râšan, related to râst, as above; cf. Mid.Pers. Rašn "Justice deity; calendar 18th day;" Av. rašnu- "the Zoroastrian Justice deity, orientation."

right angle
  زاویه‌ی ِ راست   
zâviye-ye râst

Fr.: angle droit   

An angle of 90°.

right; → angle.

right ascension
  راست‌افراز   
râst afrâz (#)

Fr.: ascension droite   

A coordinate in the → equatorial system measured from the → vernal equinox eastward to the point where the object → hour circle intersects the → celestial equator. Right ascension (symbol α) is expressed in hours, minutes, and seconds. See also: → declination.

right; ascension, M.E. ascencioun, from O.Fr., from L. ascendere "to climb up," from → ad- "to" + scandere "to climb."

Râst, → right; afrâz present stem of afrâzidan, afrâštan "to raise, exalt, extole," from Mid.Pers. abrâstan, abrâz- "to lift, raise," from ab-, from O.Pers./Av. abiy-/aiwi- "to, upon, against;" cf. Skt. abhi-, Gk. amphi- + râst "straight, direct, true;" from O.Pers. rāsta- "straight, true," rās- "to be right, straight, true;" Av. rāz- "to direct, put in line, set," razan- "order;" cf. Skt. raj- "to direct, stretch," rjuyant- "walking straight;" Gk. orektos "stretched out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Ger. recht; E. right; PIE base *reg- "move in a straight line," hence, "to direct, rule."

right triangle
  سه‌بر ِ راست   
sebar-e râst (#)

Fr.: triangle droit   

A triangle one of whose angles is a → right angle.

right; → triangle.

right-hand rule
  رزن ِ دست ِ راست   
razan-e dast-e râst

Fr.: règle de la main droite   

See → Fleming's rules.

right; → hand; → rule.

right-hand screw rule
  رزن ِ پیچ ِ راست‌گرد   
razan-e pic-e rast-gard

Fr.: règle de la vis droite   

A rule that gives the direction of the resultant vector in a → vector product: A x B = C. It is the direction of advance of a right-hand screw whose axis, held perpendicular to the plane of A and B, is rotated in the same sense that rotates the first-named vector (A) into the second-named vector B through the smaller angle.

right; → hand; → screw; → rule.

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