An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Kepler's first law
  قانون ِ نخست ِ کپلر  
qânun-e naxost-e Kepler (#)
Fr.: première loi de Kepler  

Planets move in elliptical paths, with the Sun at one focus of the ellipse (year 1609).

See also: → Kepler; → first; → law.