Usage History of 'spheres'

The following chart shows how frequently 'spheres' appeared in printed materials over time. For example, the word 'spheres' occurred 4 times in books in 1507 and 291,497 times in 2008. From 1507 to 2008, the word 'spheres' was used a total of 8,121,220 times in books scanned by Google. See Reference: Google Ngram project.

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