Your English writing platform
Discover LudwigDictionary
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.
Exact(6)
Learn about the different definitions of a year: a tropical year, a sidereal year, and an anomalistic year.
Because of the precession of the equinoxes (an effect of a slow wobble in Earth's rotation), the solar year is shorter than the sidereal year (365 days 6 hours 9 minutes 10 seconds), which is the time taken by the Sun to return to the same place in its annual apparent journey against the background of the stars.
Earth orbits the Sun at an average distance of about 150 million kilometers every 365.2564 mean solar days, or one sidereal year.
During one orbit around the Sun, Earth rotates about its own axis 366.26 times, creating 365.26 solar days or one sidereal year.
The astral or sidereal year is the time the sun takes to return to an apparent position in relation to the fixed stars, or 365.2564 days.
The orientation (rather than the angle) of Earth's axis also changes over time, precessing around in a complete circle over each 25,800 year cycle; this precession is the reason for the difference between a sidereal year and a tropical year.
Similar(54)
Situated in the Alpine Foreland, Lake Steisslingen provides sediments covering the last 16,000 sidereal years.
The period calculated as the basis of the chronology of the universe was the mahāyuga, consisting of 4,320,000 sidereal years.
All ages are presented in sidereal years calibrated using Calib 7.1 and the IntCal13 calibration curve (Table 2).
14C-AMS data were converted to sidereal years by means of CALIB 6.0.1 software (Reimer et al., 2009).
In the Early Classic period the Maya kings began to dedicate a new stela, or other monument, to mark the end of each k'atun cycle (representing 7,200 days, just under 20 sidereal years).
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com