Usage History of 'isogonals'

The following chart shows how frequently 'isogonals' appeared in printed materials over time. For example, the word 'isogonals' occurred 8 times in books in 1873 and 36 times in 2008. From 1873 to 2008, the word 'isogonals' was used a total of 1,380 times in books scanned by Google. See Reference: Google Ngram project.

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