# Solar cycle 15

> Solar activity from 1913 to 1923

**Wikidata**: [Q7556125](https://www.wikidata.org/wiki/Q7556125)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Solar_cycle_15)  
**Source**: https://4ort.xyz/entity/solar-cycle-15


## References

1. Freebase Data Dumps. 2013