Usage History of 'heliac'

The following chart shows how frequently 'heliac' appeared in printed materials over time. For example, the word 'heliac' occurred 2 times in books in 1722 and 88 times in 2008. From 1722 to 2008, the word 'heliac' was used a total of 1,239 times in books scanned by Google. See Reference: Google Ngram project.

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