Usage History of 'precessional'

The following chart shows how frequently 'precessional' appeared in printed materials over time. For example, the word 'precessional' occurred 8 times in books in 1817 and 1,633 times in 2008. From 1817 to 2008, the word 'precessional' was used a total of 77,046 times in books scanned by Google. See Reference: Google Ngram project.

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