Usage History of 'perihelion'

The following chart shows how frequently 'perihelion' appeared in printed materials over time. For example, the word 'perihelion' occurred 2 times in books in 1698 and 10,586 times in 2008. From 1698 to 2008, the word 'perihelion' was used a total of 387,035 times in books scanned by Google. See Reference: Google Ngram project.

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