An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Joy's law
  قانون ِ جوی  
qânun-e Joy
Fr.: loi de Joy  

Sunspot pairs or groups are tilted with the → leader spots closer to the equator than the → follower spots. The tilt of bipolar sunspot pairs increases with latitude.

See also: Alfred Harrison Joy (1882-1973), an American astronomer; → law.