# Johann Placentinus

> Polish German mathematician, philosopher, astronomer and professor

**Wikidata**: [Q95008423](https://www.wikidata.org/wiki/Q95008423)  
**Source**: https://4ort.xyz/entity/johann-placentinus


## References

1. Encyklopedia filozofii polskiej
2. Mathematics Genealogy Project
3. Catalog of the German National Library
4. Virtual International Authority File
5. [LIBRIS. 2018](https://libris.kb.se/khw059m31vj91qw)