# cisiojanus

> type of astronomical calendar used in the Middle Age

**Wikidata**: [Q639935](https://www.wikidata.org/wiki/Q639935)  
**Source**: https://4ort.xyz/entity/cisiojanus


## References

1. [Bibliography of the History of the Czech Lands](https://biblio.hiu.cas.cz/records/ccda1c22-96dc-48b1-b14b-08432ce02960)
2. Wikibase TDKIV