Usage History of 'retrograde'

The following chart shows how frequently 'retrograde' appeared in printed materials over time. For example, the word 'retrograde' occurred 2 times in books in 1575 and 76,435 times in 2008. From 1575 to 2008, the word 'retrograde' was used a total of 2,038,090 times in books scanned by Google. See Reference: Google Ngram project.

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