sidereal
adjective(si-de-re-al)
of, relating to, or expressed in relation to stars or constellations : astral
sidereal
noun(si-de-re-al)
the interval between two successive transits of a point on the celestial sphere (such as the vernal equinox) over the upper meridian of a place : 23 hours, 56 minutes, 4.1 seconds of mean time
sidereal
noun(si-de-re-al)
the 24th part of a sidereal day
sidereal
noun(si-de-re-al)
the 60th part of a sidereal hour
sidereal
noun(si-de-re-al)
the mean time of the moon's revolution in its orbit with reference to a star's position : 27 days, 7 hours, 43 minutes, 11.5 seconds of mean time
sidereal
noun(si-de-re-al)
the 60th part of a sidereal minute
sidereal
noun(si-de-re-al)
time based on the sidereal day
sidereal
noun(si-de-re-al)
the hour angle of the vernal equinox at a place
sidereal
noun(si-de-re-al)
the time in which the earth completes one revolution in its orbit around the sun measured with respect to the fixed stars : 365 days, 6 hours, 9 minutes, and 9.5 seconds of mean time