# atomic clock

> extremely accurate reference clock used as a standard for timekeeping

**Wikidata**: [Q227467](https://www.wikidata.org/wiki/Q227467)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Atomic_clock)  
**Source**: https://4ort.xyz/entity/atomic-clock


## References

1. Integrated Authority File
2. [Source](https://eandt.theiet.org/content/articles/2015/06/atomic-time-60-years-of-the-ultra-precise-atomic-clock/)
3. [Source](https://web.archive.org/web/20171017151756/http://www.npl.co.uk/60-years-of-the-atomic-clock/)
4. Freebase Data Dumps. 2013
5. BBC Things
6. National Library of Israel
7. KBpedia
8. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)