Usage History of 'planisphere'

The following chart shows how frequently 'planisphere' appeared in printed materials over time. For example, the word 'planisphere' occurred 6 times in books in 1524 and 1,519 times in 2008. From 1524 to 2008, the word 'planisphere' was used a total of 42,019 times in books scanned by Google. See Reference: Google Ngram project.

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