An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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4 terms — U › UM
umbra
  سایه  
sâyé (#)
Fr.:ombre

  1. Optics: A dark area, especially the blackest part of a shadow from which all light is cut off. → penumbra.

  2. Sun: The central darkest part of a → sunspot, which is also the coolest part (~ 4,200 K).

Etymology (EN): From L. umbra “shade, shadow.”

Etymology (PE): Sâyé “shadow,” from Mid.Pers. sâyak “shadow;” Av. a-saya- “throwing no shadow;” Skt. chāya- “shadow;” Gk. skia “shade;” Rus. sijat’ “to shine;”
M.H.G. schinen, O.H.G. skinan, Ger. Schein “glow, shine;” PIE base *skai- “bright.”

umbra
  سایه  
sâyé (#)
Fr.:ombre

  1. Optics: A dark area, especially the blackest part of a shadow from which all light is cut off. → penumbra.

  2. Sun: The central darkest part of a → sunspot, which is also the coolest part (~ 4,200 K).

Etymology (EN): From L. umbra “shade, shadow.”

Etymology (PE): Sâyé “shadow,” from Mid.Pers. sâyak “shadow;” Av. a-saya- “throwing no shadow;” Skt. chāya- “shadow;” Gk. skia “shade;” Rus. sijat’ “to shine;”
M.H.G. schinen, O.H.G. skinan, Ger. Schein “glow, shine;” PIE base *skai- “bright.”

Umbriel
  اومبریل  
Umbriel (#)
Fr.: Umbriel

The thirteenth of Uranus’s known satellites and the third largest. It has a diameter of 1170 km and orbits Uranus every 4.144 days at a mean distance of about 265,980 km. Umbriel is very dark, with an albedo of 0.18. It has a heavily cratered surface. Umbriel was discovered by William Lassell (1799-1880) in 1851.

See also: Umbriel named for an evil spirit in Alexander Pope’s (1688-1744) poem The Rape of the Lock. Moreover, Umbriel derives from L. → umbra “shadow,” which fits the satellite’s appearance.

Umbriel
  اومبریل  
Umbriel (#)
Fr.: Umbriel

The thirteenth of Uranus’s known satellites and the third largest. It has a diameter of 1170 km and orbits Uranus every 4.144 days at a mean distance of about 265,980 km. Umbriel is very dark, with an albedo of 0.18. It has a heavily cratered surface. Umbriel was discovered by William Lassell (1799-1880) in 1851.

See also: Umbriel named for an evil spirit in Alexander Pope’s (1688-1744) poem The Rape of the Lock. Moreover, Umbriel derives from L. → umbra “shadow,” which fits the satellite’s appearance.