An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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gamma
  گاما  
gâmmâ
Fr.: gamma  

  1. The third letter of the Greek alphabet (γ, Γ).

  2. Symbol used to denote the ratio of the principal specific heats CP/CV of a gas, where CP is the specific heat at constant pressure and CV that measured at constant volume.

  3. Unit of magnetic field intensity, equal to 10-5 gauss.

  4. The distance of the Moon’s shadow axis from Earth’s center in units of equatorial Earth radii. It is defined at the instant of → greatest eclipse when its absolute value is at a minimum (F. Espenak, NASA).

See also: The third letter of the Gk. alphabet, from Gk. gamma, from Phoenician gimel.