# sidereal day

> one day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox

**Wikidata**: [Q1778552](https://www.wikidata.org/wiki/Q1778552)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sidereal_day)  
**Source**: https://4ort.xyz/entity/sidereal-day


## References

1. Nuovo soggettario
2. [Source](https://hpiers.obspm.fr/eop-pc/models/constants.html)
3. [Jour sidéral, définition. Royal Belgian Institute for Space Aeronomy](https://www.aeronomie.be/fr/encyclopedie/jour-sideral-definition)
4. Quora
5. GF WordNet