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: 230
visibility
  دیاری، پدیداری   
diyâri, padidâri (#)

Fr.: visibilité   

1) General: The state or fact of being visible. → crescent Moon visibility, → Venus visibility.
2) Optics: → fringe visibility. See also: → visibility function, → visibility plane.
3) Meteo.: A measure of transparency of the atmosphere. The maximum horizontal distance at which objects can be identified. → turbidity.

visible + → -ity.

visibility function
  کریای ِ دیاری، ~ پدیداری   
karyâ-ye diyâri, ~ padidâri

Fr.: fonction de visibilité   

The → Fourier transform of a source's → brightness distribution, weighted by the characteristics of the → interferometer's antennas.

visibility; → function.

visibility plane
  هامن ِ دیاری، ~ پدیداری   
hâmon-e diyâri, ~ padidâri

Fr.: plan de visibilité   

In → interferometry, the projection of a → baseline onto the plane normal to the source direction defining a vector in (u,v) space, measured in wavelength units.

visibility; → plane.

visible
  دیار، پدیدار، پیدا   
diyâr (#), padidâr (#), peydâ (#)

Fr.: visible   

1) Capable of being seen by, or perceptible to, the human eye.
2) → visible light.

M.E., from O.Fr. visible, from L. visibilis "that may be seen," from visus, p.p. of videre "to see;" cognate with Pers. bin, present stem of didan "to see" (Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" cf. Skt. veda "I know;" Gk. oida "I know," idein "to see;" PIE base *weid- "to know, to see").

Diyâr "visible" in several dialects, e.g. štiyâni, Malâyeri, Širâzi, Tabari, related to didan "to see;" Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen."
Padidâr (→ phenomenon) and peydâ are both also related to dā(y)- (with prefixes).

visible horizon
  افق ِ پدیدار، ~ دیار   
ofoq-e padidâr, ~ diyâr

Fr.: horizon apparent   

That line where Earth and sky appear to meet, and the projection of this line upon the celestial sphere. Also known as the apparent horizon.

visible; → horizon.

visible light
  نور ِ دیار، ~ دیدنی   
nur-e diyâr, ~ didani

Fr.: lumière visible   

The portion of the → electromagnetic radiation that can be seen by the human → eye. The → wavelengths extend from about 400 nm (violet) to 750 nm (red). The wavelengths of various colors of the visible spectrum are as follows: → violet: 390-455 nm; → blue: 455-492 nm; → green: 492-577; → yellow: 577-597; → orange: 597-622; → red: 622-780 nm.

visible; → light.

visible spectrum
  بیناب ِ دیار، ~ دیدنی   
binâb-e diyâr, ~ didani

Fr.: spectre visible   

The portion of → electromagnetic spectrum corresponding to → visible light.

visible; → spectrum.

vision
  نگاه، دید   
negâh, did

Fr.: vision   

The act or power of sensing with the eyes. → averted vision; → acuity of vision.

M.E., from O.Fr. vision, from L. visionem (nominative visio) "act of seeing, sight, thing seen," from p.p. stem of videre "to see," cognate with Pers. bin, present stem of didan "to see" (Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" cf. Skt. veda "I know;" Gk. oida "I know," idein "to see;" PIE base *weid- "to know, to see").

Negâh, "look," from Mid.Pers. nikâh "look, glance, observation;" Proto-Iranian *ni-kas- "to look down," from ni- "down, below," → ni- (PIE), + *kas- "to look, appear;" cf. Av. nikā-, nikāta- (in the name of the 15-th nask) "that which is observed," ākas- "to look;" Mid.Pers. âkâh, Mod.Pers. âgâh "aware, knowing;" Skt. kāś- "to become visible, appear;" Ossetic kast/kaesyn "to look;" did, from didan "to see" (Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen").

visual
  دیدی، دیدگانی، دیداری   
didi (#), didgâni (#), didâri (#)

Fr.: visuel   

1) Of or pertaining to seeing or sight.
2) → optical.

M.E., from L.L. visualis "of sight," from L. visus "sight," from visus, .pp. of videre "to see;" cognate with Pers. bin, present stem of didan "to see" (Mid.Pers. wyn-; O.Pers. vain- "to see;" Av. vaēn- "to see;" cf. Skt. veda "I know;" Gk. oida "I know," idein "to see;" PIE base *weid- "to know, to see").

Didi, of or pertaining to did, from didan "to see" (Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen"); didgâni, adj. of didgân, plural of didé, did "sight, eye; seen;" didâri, from didâr, from didan.

visual acuity
  تیزنایی ِ دید   
tiznâyi-ye did

Fr.: acuité visuelle   

Same as → acuity of vision.

visual; → acuity.

visual binary
  درین ِ دیدگانی   
dorin-e didgâni

Fr.: binaire visuelle   

A → binary system of stars whose components can be resolved telescopically and which have detectable orbital motion.

visual; → binary.

visual extinction
  خاموشی ِ دیدگانی   
xâmuši-ye didgâni

Fr.: extinction visuelle   

The → extinction in the visual range of the electromagnetic radiation.

visual; → extinction

visual magnitude
  برز ِ دیدگانی   
borz-e didgâni

Fr.: magnitude visuelle   

The → apparent magnitude of a celestial body in the color sensitivity region of the human eye at a wavelength of 5600 Å. Visual magnitude is now essentially synonymous with V magnitude, which is determined photometrically.

visual; → magnitude.

visualization
  چشم‌دید   
cašm-did

Fr.: visualisation   

1) The act of visualizing (→ visualize).
2) The presentation of → information on a → screen.

Verbal noun of → visualize.

Cašm-did, Mid.Pers. cašm-did "visible," Mod.Pers. cašm-didâr by Tusi, in Pers. translation of Sufi's "Book of Fixed Stars," from cašm "eye" (Mid.Pers. cašm, Av. cašman- "eye," ākas- "to look," from prefix ā- + Proto-Iranian *kas- "to look, appear," cf. Skt. cáksus- "seeing") + did past stem of didan "to see" (Mid.Pers. ditan "to see, regard, catch sight of, contemplate, experience;" O.Pers. dī- "to see;" Av. dā(y)- "to see," didāti "sees;" cf. Skt. dhī- "to perceive, think, ponder; thought, reflection, meditation," dādhye; Gk. dedorka "have seen").

visualize
  چشم‌دید کردن   
cašm-did kardan

Fr.: visualiser   

1) To make → visual or → visible.
2) To present → image or → information on a → screen, usually a → computer  → display.

From → visual + → -ize; → visualization.

viticulture
  موکاری   
mowkâri (#)

Fr.: viticulture   

The science, production, and study of → grapes.

From L. viti(s) "vine" + → culture.

Mowkâri, from mowvine + kâri noun from kâštan "to cultivate," → culture.

VLT Interferometer (VLTI)
  اندرزنش‌سنج ِ VLT   
andarzanešsanj-e VLT

Fr.: interféromètre VLTI   

An interferometer using a combination of the four 8.2 m VLT telescopes with the assistance of one or more of the the four 1.8 m Auxiliary Telescopes in order to achieve a very high spatial resolution. The system works in the visible and near- and mid-infrared wavelengths.

Very Large Telescope (VLT); → interferometer.

vocabulary
  واژگان   
vâžgân (#)

Fr.: vocabulaire   

A set of words used by a → language, group, individual, or work, or in a field of → knowledge.

M.L. vocabularium "a list of words," from L. vocabulum "word, name, noun," from vocare "to name, call;" cognate with Pers. vâž, → word.

Vâžgân, from vâž, → word, + -gân suffix forming plural entities, from Mid.Pers. -gânag, -gâna, from Proto-Iranian *kāna-ka-.

vocal cord
  تار ِ آواز   
târ-e âvâz

Fr.: corde vocale   

The sharp edge of a fold of mucous membrane stretching along either wall of the larynx from the angle between the laminae of the thyroid cartilage to the vocal process of the arytenoid cartilage. Vibrations of these cords are used in voice production (The American Heritage).

voice; → cord.

Vogt-Russell theorem
  فربین ِ فوکت-راسل   
farbin-e Vogt-Russell

Fr.: théorème de Russell-Vogt   

The internal structure and all observable characteristics of a star (such as luminosity and temperature) are determined uniquely by its mass, chemical composition, and age. Same as → Russell-Vogt theorem.

Named after the German astronomer Heinrich Vogt (1890-1968) and the American astronomer Henry Norris Russell (1877-1957); → theorem.

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