different between facular vs faculae

English

facula +? -ar

facular (not comparable)

(astronomy) Of or pertaining to the faculae.
- 1873, Richard A. Proctor, The Borderland of Science: A Series of Familar Dissertations on Stars, Planets, and Meteors
  While we were still far from the place of explosion , and intent on the study of the great facular waves which were passing swiftly beneath us , we suddenly heard a series of explosions so tremendous

faculae

faculae

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