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: 1308
Cygnus OB2 (Cyg OB2)
   OB2 ماکیان   
OB2 Mâkiyân

Fr.: Cygnus OB2   

The nearest example of a → massive star region of → star formation, containing 65 known → O-type stars and hundreds of → B-type stars. Cygnus OB2 lies at a distance of 1.45 → kpc. It is the central association, the most famous, and one of the youngest of the Cygnus region. Cyg OB2 possibly has two → populations with ages of 3.5-5 Myr, while the → O stars seem to belong to a younger population, aged about 2 Myr.

Cygnus; → OB association; 2 because there are several OB associations in Cygnus; → Cygnus OB association.

Cygnus X-1
  ماکیان X-۱   
Mâkiyân X-1

Fr.: Cygnus X-1   

A → binary system containing one of the best candidates for a → black hole. Cygnus X-1 was discovered as an → X-ray source in 1965. It is one of the brightest X-ray sources on the sky, so that it was detected by the earliest → X-ray observation attempts. This binary system, distant of 2.5 kpc, consists of the O9.7 Iab type → supergiant HDE 226868 and a → compact object orbiting around with a period of 5.6 days. The mass of the unseen companion, significantly larger than 5 → solar masses, suggests that it is a black hole. Focused → wind accretion from a → primary star being extremely close to filling the → Roche lobe drives the powerful source of the X-ray radiation.

Cygnus.

cylinder
  استوانه   
ostovâné (#)

Fr.: cylindre   

The surface traced by one side of a rectangle rotating about its parallel side, the latter serving as axis.

From Fr. cylindre, from L. cylindrus "roller, cylinder," from Gk. kylindros "a cylinder, roller, roll," from kylindein "to roll."

Osotvâné, from sotun "column," Mid.Pers. stun, from O.Pers. stênâ "column," Av. stuna-, Skt. sthuna- "column."

cylindrical
  استوانه‌ای   
ostovâne-yi (#)

Fr.: cylindrique   

Of, pertaining to, or having the form of a cylinder.

From L. cylindricus, from Gk. kylindrikos, see → cylinder; → -ic; → -al.

cylindrical coordinates
  هماراهای ِ استوانه‌ای   
hamârâhâ-ye ostovâne-yi (#)

Fr.: coordonnées cylindriques   

A coordinate system for a point in space, using an origin (O) and three perpendicular axes (Ox, Oy, Oz), in which a point (P) in space is specified by three numbers ρ, φ, z. The two first numbers, ρ and φ, are → polar coordinates for the vertical projection of P on the xy-plane, and z is the vertical distance of P from the xy-plane.

cylindrical; → coordinate.

cylindrical lens
  عدسی ِ استوانه‌ای   
adasi-ye ostovâneyi (#)

Fr.: lentille cylindrique   

A lens in which at least one surface is formed like a portion of a cylinder. Also called astigmatic lens.

cylinder; → lens.

Cynthian
  ماهی، مانگی   
mâhi (#), mângi (#)

Fr.: cynthien   

Referring to the Moon.

From L. Cynthia "the Moon," from Gk. Kynthia "woman from Kynthos." Kynthos was the mountain on Delos on which she and her twin brother Apollo were born.

Mâhi, mângi referring to mâh, mâng, → moon.

Cytherean
  ناهیدی   
Nâhidi (#)

Fr.: cythérien   

Referring to the planet Venus.

From Cythera, in Gk. mythology another name of Aphrodite (Roman equivalent Venus), goddess of love and beauty, since she was believed to emerge from the Mediterranean island Cythera.

Nâhidi referring to Nâhid, planet Venus, Mid.Pers. Anahid "immaculate, unstained," goddess of pure waters and fertility, from Av. arədvi-sûra-anâhita, from arədvi- "increasing, rising," + sûra- "strong, powerful" (Skt. śūra- "valient, courageous") + anâhita "unstained," from an- negation prefix + âhita "spotted."

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