Usage History of 'parallax'

The following chart shows how frequently 'parallax' appeared in printed materials over time. For example, the word 'parallax' occurred 2 times in books in 1635 and 26,684 times in 2008. From 1635 to 2008, the word 'parallax' was used a total of 922,069 times in books scanned by Google. See Reference: Google Ngram project.

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