Usage History of 'aurorae'

The following chart shows how frequently 'aurorae' appeared in printed materials over time. For example, the word 'aurorae' occurred 4 times in books in 1751 and 737 times in 2008. From 1751 to 2008, the word 'aurorae' was used a total of 68,506 times in books scanned by Google. See Reference: Google Ngram project.

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