Usage History of 'perihelial'

The following chart shows how frequently 'perihelial' appeared in printed materials over time. For example, the word 'perihelial' occurred 2 times in books in 1858 and 18 times in 2008. From 1858 to 2008, the word 'perihelial' was used a total of 2,754 times in books scanned by Google. See Reference: Google Ngram project.

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