returning to the same orbital position relative to the background stars.

In 2025, the sidereal year equals {{val ephemeris days}} (365 days, 6 hours, 9 minutes and 9.8 seconds).

The sidereal year differs from the tropical year, "the period of time required for the ecliptic longitude of the Sun to increase 360 degrees", due to the precession of the equinoxes. The sidereal year is 20 minutes 24.7 seconds longer

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