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A sidereal day is one Earth rotation relative to the stars; a solar day is one Earth rotation relative to the Sun. The Earth rotates about 366 times per 'normal' 365-day year relative to the stars, so Earth's sidereal day is about four minutes shorter than Earth's solar day. (Angle exaggerated for visibility.) Animation comparing a sidereal day to a solar day
Sidereal time ("sidereal" pronounced /saɪˈdɪəriəl, sə-/ sy-DEER-ee-əl, sə-) is a system of timekeeping used especially by astronomers. Using sidereal time and the celestial coordinate system, it is easy to locate the positions of celestial objects in the night sky. Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the fixed stars". A sidereal day (also known as the sidereal rotation period) represents the time for one rotation about the planet axis relative to the stars.