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- DictionaryRe·gi·o·mon·ta·nus, Johannes/ˌrāɡēōˌmônˈtänəs/
- 1. (1436–76), German astronomer and mathematician; born Johannes Müller. Considered the most important astronomer of the 15th century, he translated Ptolemy's Mathematical Syntaxis and wrote four monumental works on mathematics and astronomy.
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