An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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ring opening angle
  زاویه‌ی ِ گشایش ِ حلقه  
zâviye-ye gošâyeš-e halqé
Fr.: angle d'ouverture des anneaux  

Of → Saturn, the angle between the line of sight and the ring plane. Also known as elevation angle, tilt angle.

Etymology (EN): → ring; → open;
→ angle.

Etymology (PE): Zâviyé, → angle; gošâyeš “opening,” verbal noun from
gošudan, gošâdan “to open up, loose, let free;” gošâd “opened; ample, broad;” Mid.Pers. wišâdan “to let free;” Khotanese hīyā “bound;” O.Pers. višta “untied, loosened,” vištāspa- “with loosened horses” (personal name); Av. višta “untied,” ā-hišāiiā “holds fettered,” hita- “fastened, tied on, put to;” cf. Skt. sā- “to bind, fasten, fetter,” sitá- “bound,” ví-sita- “untied;” halqé, → ring.