Associations to the word «Sidereal»

SIDEREAL, adjective. Of or relating to the stars.

SIDEREAL, adjective. (astronomy) Relating to a measurement of time relative to the position of the stars.

SIDEREAL, adjective. (astronomy) Relating to a measurement of time relative to the point of the vernal equinox.

SIDEREAL ASTROLOGY, noun. (astrology) A form of astrology that measures the position of the sun relative to the stars. This compensates for the precession of Earth's axis, which causes the zodiac signs to move around the sky relative to the vernal equinox.

SIDEREAL DAY, noun. (astronomy) one day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds)

SIDEREAL DAY, noun. (astronomy) rotational period of Earth; the time in which Earth rotates around its axis 360 degrees

SIDEREAL ORBITAL PERIOD, noun. (astronomy) The sidereal year of a planet. (I.e., in the definition for "sidereal year", replace "Earth" by the given planet.)

SIDEREAL PERIOD, noun. (astronomy) sidereal orbital period

SIDEREAL PERIOD, noun. (astronomy) sidereal rotation period

SIDEREAL ROTATION PERIOD, noun. (astronomy) The sidereal day of a planet. (I.e., in the definition for "sidereal day", replace "Earth" by the given planet.)

SIDEREAL TIME, noun. (astronomy) Time measured by the apparent diurnal motion of the vernal equinox; approximated by that based on the rotation of the Earth relative to the stars

SIDEREAL YEAR, noun. The orbital period of the Earth; a measure of the time it takes for the Sun to return to the same position with respect to the stars of the celestial sphere. A sidereal year is about 20.4 minutes longer than the tropical year due to precession of the equinoxes.

SIDEREAL YEARS, noun. Plural of sidereal year

SIDEREAL, adjective. Of or relating to the stars or constellations; "sidereal bodies"; "the sidereal system".

SIDEREAL, adjective. (of divisions of time) determined by daily motion of the stars; "sidereal time".