# Otto Knopf

> German astronomer

**Wikidata**: [Q94840118](https://www.wikidata.org/wiki/Q94840118)  
**Source**: https://4ort.xyz/entity/otto-knopf-q94840118


## References

1. Catalog of the German National Library
2. BnF authorities
3. Mathematics Genealogy Project
4. Czech National Authority Database
5. Virtual International Authority File