sidereal
51sidereal day — noun the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day • Syn: ↑day • Hypernyms: ↑time unit, ↑unit of time, ↑sidereal time …
52sidereal month — noun period between successive conjunctions with a star, 27.322 days • Hypernyms: ↑month, ↑sidereal time …
53sidereal year — noun the time for the earth to make one complete revolution around the sun, relative to the fixed stars • Hypernyms: ↑year, ↑sidereal time …
54sidereal clock — noun : an astronomical clock regulated to sidereal time …
55sidereal midnight — noun : the instant when the March equinox crosses the lower meridian of a place compare sidereal day …
56sidereal minute — noun : the sixtieth part of a sidereal hour …
57sidereal period — noun or sidereal revolution : the time in which a planet or satellite completes one revolution round its primary as referred to a star seen from the primary …
58sidereal second — noun : the sixtieth part of a sidereal minute compare second 2 …
59sidereal revolution — noun see sidereal period …
60sidereal — adjective Etymology: Latin sidereus, from sider , sidus star, constellation Date: 1647 of, relating to, or expressed in relation to stars or constellations ; astral …