Usage History of 'equatorial'

The following chart shows how frequently 'equatorial' appeared in printed materials over time. For example, the word 'equatorial' occurred 38 times in books in 1590 and 72,559 times in 2008. From 1590 to 2008, the word 'equatorial' was used a total of 2,852,702 times in books scanned by Google. See Reference: Google Ngram project.

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