# Zeller's congruence

> algorithm to calculate the day of the week in the Gregorian and Julian calendars

**Wikidata**: [Q2140717](https://www.wikidata.org/wiki/Q2140717)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Zeller's_congruence)  
**Source**: https://4ort.xyz/entity/zeller-s-congruence


## References

1. Freebase Data Dumps. 2013
2. Quora