Usage History of 'tropic'

The following chart shows how frequently 'tropic' appeared in printed materials over time. For example, the word 'tropic' occurred 33 times in books in 1507 and 39,584 times in 2008. From 1507 to 2008, the word 'tropic' was used a total of 991,255 times in books scanned by Google. See Reference: Google Ngram project.

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