An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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eclipse obscuration
  تیره‌شد ِ خورگرفت  
tirešod-e xorgereft
Fr.: obscuration de l'éclipse  

The fraction of the Sun’s area occulted by the Moon. It should not be confused with → eclipse magnitude,
which is the fraction of the Sun’s diameter occulted by the Moon. Eclipse obscuration may be expressed as either a percentage or a decimal fraction (e.g., 50% or 0.50) (F. Espenak, NASA).

See also: → eclipse; obscuration, verbal noun from → obscure.