# Solar cycle 20

> Solar activity from 1964 to 1976

**Wikidata**: [Q7556137](https://www.wikidata.org/wiki/Q7556137)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Solar_cycle_20)  
**Source**: https://4ort.xyz/entity/solar-cycle-20


## References

1. Freebase Data Dumps. 2013