An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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sunspot minimum
  کمینه‌ی ِ هورلک  
kamine-ye hurlak
Fr.: minimum des taches  

Periods of time when the → relative sunspot number is low. These periods of time occur approximately every 11 years and represent the minimum in the → sunspot cycle.

See also: → sunspot; → minimum.