Dee spent much of his later life attempting to summon angels to learn the secrets of creation from them, with the assistance of a scryer, while advising naval expeditions with his extensive knowledge of geography and cartography.
==Occult works==
While Dee was a devout Christian, his faith and religion were extremely heterodox. His works on alchemy, astrology, and mathematics have become popular among occult circles, while his angel diaries were compiled as ''John Dee's Books of Mystery.''
==References==