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1911 Encyclopedia Britannica
(diminutive of fax, Lat. for "torch"), in astronomy, a minute shining spot on the sun's disk, markedly brighter than the photosphere in general, usually appearing in groups. Faculae are most frequent in the neighbourhood of spots. (See SuN.)
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Chisholm, Hugh, General Editor. Entry for 'Facula'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/f/facula.html. 1910.