# year

> the orbital period of the Earth: the estimated period of time for the Earth's orbit around the Sun and observed at a fixed geographic point (averaging 365.24 days); base later modified to define or adjust various calendars

**Wikidata**: [Q577](https://www.wikidata.org/wiki/Q577)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Year)  
**Source**: https://4ort.xyz/entity/year


## References

1. ISO 80000-3:2006 Quantities and units — Part 3: Space and time
2. Integrated Authority File
3. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=7284)
4. Explanatory Supplement to the Astronomical Almanac 3rd ed.
5. Nuovo soggettario
6. YSO-Wikidata mapping project
7. Astronomical Almanac for the Year 2017
8. BabelNet
9. FactGrid
10. National Library of Israel
11. KBpedia