Usage History of 'nightglow'

The following chart shows how frequently 'nightglow' appeared in printed materials over time. For example, the word 'nightglow' occurred 2 times in books in 1903 and 231 times in 2008. From 1903 to 2008, the word 'nightglow' was used a total of 13,315 times in books scanned by Google. See Reference: Google Ngram project.

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