Usage History of 'precession'

The following chart shows how frequently 'precession' appeared in printed materials over time. For example, the word 'precession' occurred 2 times in books in 1637 and 21,141 times in 2008. From 1637 to 2008, the word 'precession' was used a total of 680,695 times in books scanned by Google. See Reference: Google Ngram project.

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