time taken by the Earth to orbit the Sun once with respect to the fixed stars
A sidereal year (/saɪˈdɪəri.əl/, US also /sɪ-/; from Latin sidus 'asterism, star'), also called a sidereal orbital period, is the time that Earth or another planetary body takes to orbit the Sun once with respect to the fixed stars.
Thus, a sidereal year is the interval required for Earth to travel once around the ecliptic, completing one revolution about the Sun and returning to the same orbital position relative to the background stars.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).