Usage History of 'photosphere'

The following chart shows how frequently 'photosphere' appeared in printed materials over time. For example, the word 'photosphere' occurred 1 time in books in 1799 and 5,904 times in 2008. From 1799 to 2008, the word 'photosphere' was used a total of 301,639 times in books scanned by Google. See Reference: Google Ngram project.

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