determined by or from the stars:
of or relating to the stars.
of, relating to, or involving the stars
determined with reference to one or more stars: the sidereal day
Relating to the stars or constellations.
Measured with respect to the background of fixed stars instead of the Sun.
noun, Astronomy. 1. the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day. sidereal day noun 1. See day (sense 5)
- Sidereal hour
noun 1. a 24th part of a sidereal day
noun, Astronomy. 1. the angle, measured westward through 360°, between the hour circle passing through the vernal equinox and the hour circle of a celestial body.
noun, Astronomy. 1. See under month (def 5). noun 1. Also called calendar month. any of the twelve parts, as January or February, into which the calendar year is divided. 2. the time from any day of one calendar month to the corresponding day of the next. 3. a period of four weeks or 30 […]