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: 4 Search : visible
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.