Usage History of 'penumbras'

The following chart shows how frequently 'penumbras' appeared in printed materials over time. For example, the word 'penumbras' occurred 4 times in books in 1718 and 734 times in 2008. From 1718 to 2008, the word 'penumbras' was used a total of 22,372 times in books scanned by Google. See Reference: Google Ngram project.

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