Relating to the stars; starry; astral; as, sidereal astronomy.

Measuring by the apparent motion of the stars; designated, marked out, or accompanied, by a return to the same position in respect to the stars; as, the sidereal revolution of a planet; a sidereal day.

time measured in relation to the fixed stars: the length of a sidereal day is 23 hr, 56 min, 4.09 sec of mean solar time.

(Chapter 3) - of or relating to the stars.

Containing stars; starry; as sidereal regions. Sidereal year, in astronomy, the period in which the

measured relative to the stars rather than the Sun.

of or relating to the stars or constellations; "sidereal bodies"; "the sidereal system"

(of divisions of time) determined by daily motion of the stars; "sidereal time"

A sidereal period is one with respect to stars. For example, a sidereal day is the time it takes for the stars in the celestial sphere to revolve once. A sidereal year is the time it takes for the Sun to return to the same point in the sky with respect to the stars. See also synodic period.

Of, relating to, or concerned with the stars. Sidereal rotation is that measured with respect to the stars rather than with respect to the Sun or the primary of a satellite.