sidereal

• Относящийся к звёздам или созвездиям; измеряемый или определяемый по видимому движению звёзд.

Relating to the stars or constellations; measured or determined by the apparent motion of the stars.

1. Relating to starsC2formalscientific

   Pertaining to the stars or constellations in the sky.

   Звёздный

   • Sidereal navigation was essential for ancient sailors.
   • The sidereal map shows the positions of constellations.
   • Astronomers study sidereal phenomena to understand the universe.

   Synonymsastralcelestialstarrystellar

2. Based on star motionC2formalscientific

   Describing time measurements that are based on the apparent daily motion of the stars, rather than the Sun.

   Звёздный

   • A sidereal day is about 4 minutes shorter than a solar day.
   • Sidereal time is used by astronomers to track celestial objects.
   • The sidereal year is the time it takes for Earth to orbit the Sun relative to the fixed stars.